BOAC Flight 777
Artist's impression of G-AGBB
|Date||1 June 1943|
|Summary||Attacked by eight German Junkers Ju 88 fighters of KG 40, crashed into the sea|
|Site||Bay of Biscay, off the coast of Spain and France
|Aircraft type||Douglas DC-3-194|
|Operator||British Overseas Airways Corporation, (owner KLM)|
|Flight origin||Lisbon Portela Airport, Portugal|
|Destination||Bristol (Whitchurch) Airport, United Kingdom|
BOAC Flight 777-A was a scheduled British Overseas Airways Corporation civilian airline flight from Portela Airport in Lisbon, Portugal, to Whitchurch Airport near Bristol, England, on 1 June 1943. It was attacked en route by eight German Junkers Ju 88s and crashed into the Bay of Biscay, resulting in the deaths of all 17 "souls on board".[N 1] There were several notable passengers, amongst them actor Leslie Howard.
Theories abound that the aircraft, a Douglas DC-3, was attacked because the Germans believed that British Prime Minister Winston Churchill was aboard. Other theories suggest the DC-3 was targeted because several passengers, including Howard, were British spies. During the Second World War, British and German civilian aircraft operated out of the same facilities at Portela and the incoming and outgoing traffic was watched by Allied and Axis spies. The Lisbon–Whitchurch route frequently carried agents and escaped POWs to Britain.
While aircraft flying the Lisbon–Whitchurch route were left unmolested at the beginning of the war, and both Allied and Axis powers respected the neutrality of Portugal, the air war over the Bay of Biscay, north of Spain and off the west coast of France, had begun to heat up in 1942, and the Douglas DC-3 lost in this attack had twice survived attacks by Luftwaffe fighters in November 1942 and April 1943.
- 1 Historical background
- 2 Flight details
- 3 Attack
- 4 Theories for the attack
- 5 Legacy of the disaster
- 6 See also
- 7 References
- 8 External links
When war broke out in Europe, the British Air Ministry prohibited private flying and most domestic air services. Imperial Airways and British Airways Ltd, in the process of being merged and nationalised as BOAC, were evacuated from Croydon Aerodrome and Heston Aerodrome to Whitchurch, outside Bristol. After the fall of Norway, the Netherlands, Belgium and France, and Italy's entry to the war, only Sweden, Ireland and Portugal remained as European destinations for BOAC (the USA was just within range of BOAC's Empire flying boats by refuelling in Newfoundland). Over the UK, civil aircraft were restricted to between 1,000 and 3,000 feet (300 and 910 m) and could only fly during daylight to ease identification. The British government also restricted flights to diplomats, military personnel, VIPs, and anyone else with government approval.
KLM pilots and aircraft
For several weeks prior to the German invasion of The Netherlands, KLM, the Royal Dutch Airline, operated a direct, over-water, twice-weekly DC-3 service from Amsterdam to Portugal avoiding French, British and Spanish airspace to connect with the new Pan American flying boat service from the USA to Lisbon. When Germany invaded in May 1940, KLM had several airliners en route outside The Netherlands. Some managed to fly to Britain while others stranded east of Italy continued to link British and Dutch territories from Palestine to Indonesia (and Australia). The British government interned the Dutch aircraft at Shoreham Airport and after negotiations the Air Ministry and the Dutch government-in-exile contracted to use the former KLM aircraft and crews to replace de Havilland Albatross aircraft on a scheduled service between Britain and Portugal which BOAC started in June 1940 from Heston Aerodrome.[N 2]
After the initial reservations about using Dutch crews were overcome, all-Dutch crews were used, although the flights used BOAC flight numbers and passenger handling. The KLM contingent was housed at BOAC's Whitchurch base. The UK-Lisbon service operated up to four times per week. From 20 September 1940, passengers were flown from Whitchurch (although Heston continued as London terminus for KLM from 26 June till 20 September 1940), and for Lisbon, the pre-war grass airfield at Sintra was used until October 1942, when the new runway was ready at Portela Airport, on the northern edge of Lisbon. By June 1943, in over 500 flights, KLM/BOAC had carried 4,000 passengers.
Originally, five Douglas DC-3s and one Douglas DC-2 airliner were available but with the loss of a DC-3 on 20 September 1940 in a landing accident at Heston and the destruction of another DC-3 in November 1940 by Luftwaffe bombing at Whitchurch, only four aircraft remained: DC-2 G-AGBH Edelvalk (ex-PH-ALE), DC-3 G-AGBD Buizerd (ex-PH-ARB), DC-3 G-AGBE Zilverreiger (ex-PH-ARZ) and DC-3 G-AGBB Ibis (ex-PH-ALI). In 1939, with war tensions in Europe increasing, KLM had painted their DC-2s and DC-3s bright orange to mark them clearly as civilian aircraft. BOAC repainted the aircraft in camouflage, with British civil markings and red/white/blue stripes like all BOAC aircraft, but without the Union Flag. They were later marked with their Dutch bird names under the cockpit windows. The interiors remained in KLM colours and markings.
British and German civilian aircraft operated from the same facilities at Portela and traffic was watched by Allied and Axis spies, including British, German, Soviet and American. This was especially the case for the Lisbon–Whitchurch route, which frequently carried agents and escaped POWs to Britain. German spies were posted at terminals to record who was boarding and departing flights on the Lisbon–Whitchurch route. Harry Pusey, BOAC's operations officer in Lisbon between 1943 and 1944 described the area as "like Casablanca, but twentyfold".
Previous attacks on the same aircraft
Most of the aircraft flying the Lisbon–Whitchurch route were left unmolested after the beginning of the war. Both Allied and Axis powers respected the neutrality of countries such as Portugal, Sweden and Switzerland and refrained from attacking flights into and out of those nations. However, the war over the Bay of Biscay, north of Spain and off the west coast of France, began to heat up in 1942.
The Germans opened the Atlantic Command at Merignac near Bordeaux and Lorient to attack Allied shipping. In 1943, fighting over the area intensified and the RAF and Luftwaffe saw increased losses. This meant increased danger for BOAC aircraft running Lisbon–Whitchurch.
On 15 November 1942, G-AGBB Ibis, the KLM aircraft later destroyed in the downing of Flight 777-A, was attacked by a single Messerschmitt Bf 110 fighter, but she was able to limp on to Lisbon where repairs were carried out. The damage sustained by cannon and machine gun fire included the port wing, engine nacelle and fuselage.[N 3] For damage pictures see 'External links' below.
On 19 April 1943, the same aircraft was again attacked at coordinates 46 North, 9 West, by a schwarm of six Bf 110 fighters. Captain Koene Dirk Parmentier evaded the attackers by dropping to 50 feet above the ocean and then climbing steeply into the clouds. The Ibis again sustained damage to the port aileron, shrapnel to the fuselage and a holed fuel tank. A new wingtip was flown to Lisbon to complete repairs. Despite these attacks, KLM and BOAC continued to fly the Lisbon–Whitchurch route.
Although there were still two other KLM DC-3's and one KLM DC-2 in use by BOAC on the same route only the G-AGBB Ibis was attacked.
Aircraft and crew
The Douglas DC-3-194 was the first DC-3 delivered to KLM on 21 September 1936 and originally carried the registration number PH-ALI and was named Ibis, the bird venerated in the ancient world. In the afternoon of 9 May 1940, the day before the German invasion of The Netherlands, the DC-3 arrived in Shoreham on a scheduled flight from Amsterdam under captain Quirinus Tepas. After the German invasion, the aircraft and its crew were instructed to remain in Britain. On 25 July 1940, the registration number was changed to G-AGBB and the aircraft was camouflaged in the standard brown-green RAF scheme of the time.
There were four Dutch crew on the flight: Captain Quirinus Tepas OBE; Second in command, Captain Dirk de Koning (also aboard the first attack on 15 November 1942); wireless operator, Cornelis van Brugge (also known from the London-Melbourne race) and flight engineer Engbertus Rosevink. Most crew members diverted to England in their aircraft after the German invasion in the Netherlands, and some of them settled in the Bristol area.
The passenger list included stage and film actor Leslie Howard; Alfred T. Chenfalls, Howard's friend and accountant; British journalist Kenneth Stonehouse, a Washington, D.C. correspondent of Reuters news agency, and his wife Evelyn Peggy Margetts Stonehouse; Mrs. Rotha Hutcheon and her daughters, Petra, 11, and Carolina, 18 months; Mrs. Cecelia Emilia Falla Paton; Tyrrell Mildmay Shervington, director of Shell-Mex Oil Company in Lisbon; Ivan James Sharp, a senior official of the United Kingdom Commercial Corporation (UKCC) who attended meetings on Tuesday mornings at the Ministry of Economic Warfare and was commissioned by the government to purchase tungsten for the war effort; Wilfrid Israel, a prominent Anglo-German Jewish activist working to save Jews from the Holocaust; Francis German Cowlrick; and Gordon Thompson MacLean.
Flight 777 was full and several people were turned back, including British Squadron Leader Wally Lashbrook.[N 4] Three passengers seated on the DC-3 disembarked before departure. Derek Partridge, the young son of a British diplomat and Dora Rove, his nanny, were "bumped" to make room for Howard and Chenhalls, who had only confirmed their tickets at 5 pm the night before the flight and whose priority status allowed them to take precedence over other passengers. A Catholic priest also left the aircraft after boarding it; to this day, the priest's identity remains unknown.[N 5]
After the war, the actor Raymond Burr erroneously claimed that he was briefly married to a Scottish actress called Annette Sutherland, who was killed on Flight 777. However, Burr's biographer Ona L. Hill writes that "no one by the name of Annette Sutherland Burr was listed as a passenger on the plane."[N 6]
The most intense intrigue surrounded actor Leslie Howard, who was at the peak of his career and had world fame after such cinematic classics as The Scarlet Pimpernel (1934) and Gone with the Wind (1939). Aside from screen accolades Howard was prized by the British government for his anti-Nazi propaganda and a number of films produced in support of the war effort, notably Pimpernel Smith (1941). During the weeks before his death, Howard was in Spain and Portugal on a lecture tour promoting The Lamp Still Burns. What is known about this trip is that the British Council invited Howard on the tour and that after initial qualms, he received further encouragement from British Foreign Secretary Anthony Eden. [N 7] A catering reception was being set up for Leslie Howard at Whitchurch aerodrome for his arrival; the chief of KLM instructed the caterers to halt preparation as notice came through that the aircraft had been attacked by German fighters over the Bay of Biscay.
Tyrrell Mildmay Shervington
Quoted above as director of Shell-Mex Oil Company in Lisbon but Shervington was also agent H.100 of the Special Operations Executive in its Iberian operation. In his book Traição a Salazar published in June 2012, José Antonio Barreiros suggests that the latter might increase the plausibility of the thesis that Shervington rather than the actor was the target of the attack.
Another passenger was Wilfrid Israel, member of an important Anglo-German Jewish family and a rescuer of Jews from the Holocaust, who had close connections to the British government. On 26 March 1943, he left Britain for Portugal and spent two months investigating the situation of Jews in Spain and Portugal. By the end of his trip, Israel found as many as 1,500 Jewish refugees in Spain, many of whom he aided in obtaining Palestine certificates. Before Israel left the peninsula, he proposed a plan to the British government to aid Jewish refugees in Spain.
7:35–10:54 am: Takeoff and flight
1 June 1943 BOAC flight from Lisbon to Whitchurch was assigned to the Ibis and given flight number 777-A. The flight was originally scheduled to take off at 0730, but was delayed when Howard left the aircraft to pick up a package he had left at customs. At 0735 GMT, Flight 777-A departed from Portela Airport at Lisbon. Whitchurch received a departure message and continued regular radio contact until 1054 GMT. At that time, while the DC-3 was roughly 200 miles (320 km) northwest of the coast of Spain, Whitchurch received a message that the DC-3 was being followed and that it was fired upon at 46.54N, 09.37W. Shortly afterwards, the aircraft crashed and sank into the Bay of Biscay.
The following day BOAC released a statement:
The British Overseas Airways Corporation regrets to announce that a civil aircraft on passage between Lisbon and the United Kingdom is overdue and presumed lost. The last message received from the aircraft stated that it was being attacked by an enemy aircraft. The aircraft carried 13 passengers and a crew of four. Next-of-kin have been informed
— The Times
The New York Times reporting from London, announced, in its 3 June 1943 edition that, "A British Overseas Airways transport plane, with the actor Leslie Howard reported among its 13 passengers, was officially declared overdue and presumed lost today ..." The article also reported - "In their daily communique, broadcast from Berlin and recorded by The Associated Press, the Germans said: 'Three enemy bombers and one transport were downed by German reconnaissance planes over the Atlantic'."
In its 14 June 1943 issue, Time magazine carried a brief story on the downing of BOAC Flight 777. The most valuable information from that article was the details of the final radio broadcast from the Dutch pilot. "I am being followed by strange aircraft. Putting on best speed. ...we are being attacked. Cannon shells and tracers are going through the fuselage. Wave-hopping and doing my best."
German pilots' account
One of the most detailed versions of the attack was revealed in Bloody Biscay: The History of V Gruppe/Kampfgeschwader 40 by Christopher H. Goss. This book states that BOAC Flight 777 was not intentionally targeted and was instead accidentally shot down when it was mistaken for an Allied military aircraft. The account is composed of the author's analysis of events and interviews, conducted decades after the war ended, with some of the German pilots involved in the attack.
According to this account, eight Junkers Ju 88C-6 heavy fighters (Zerstörer) from the 14th Staffel of the Luftwaffe's main maritime bomber wing, Kampfgeschwader 40, took off from Bordeaux at 1000 hrs local time to find and escort two U-boats; these aircraft belonged to the long-range fighter group known as Gruppe V Kampfgeschwader 40. The names of four of the eight pilots are known: Staffelführer Oberleutnant (Oblt) Herbert Hintze, Leutnant Max Wittmer-Eigenbrot, Oblt Albrecht Bellstedt, and Oberfeldwebel (Ofw) Hans Rakow. The pilots claim that before setting out they were unaware of the presence of the Lisbon to Whitchurch flights. Due to bad weather the search for the U-boats was called off and fighters continued a general search. At 1245 hrs, BOAC Flight 777 was spotted in P/Q 24W/1785 heading north. Approximately five minutes later, the Ju 88s attacked. Hintze retold his account for Goss as the following: "A 'grey silhouette' of a plane was spotted from 2,000–3,000 metres (6,600–9,800 ft) and no markings could be made out, but by the shape and construction of the plane it was obviously enemy." Bellstedt radioed: "Indians at 11 o'clock, AA (code for enemy aircraft ahead slightly to left, attack, attack)." BOAC Flight 777 was attacked from above and below by the two Ju 88s assigned to a high position over the flight, and the port engine and wing caught fire. At this point flight leader Heintze, at the head of the remaining six Ju 88s, caught up to the DC-3 and recognised the aircraft as civilian, immediately calling off the attack, but the burning DC-3 was already severely damaged with the port engine out. Three parachutists exited the burning aircraft, but their chutes did not open as they were on fire. The aircraft then crashed into the ocean where it floated and then sank. There were no signs of survivors.
Hintze states that all of the German pilots involved expressed regret for shooting down a civilian aircraft and were "rather angry" with their superiors for not informing them that there was a scheduled flight between Lisbon and Britain. Goss writes that official German records back up Hintze's account that Staffel 14/KG 40 was carrying out normal operations and that the day's events occurred because the U-boats could not be found. He concludes that "there is nothing to prove that [the German pilots] were deliberately aiming to shoot down the unarmed DC-3". This account of the German pilots and Goss's conclusions are challenged by some authorities.
Hintze's version is supplemented by the research of Ben Rosevink, a retired research technician at the University of Bristol, and son of BOAC Flight 777 flight engineer Engbertus Rosevink. In the 1980s, Rosevink tracked down and interviewed three of the German pilots involved in the attack, including the individual responsible for opening fire on BOAC Flight 777. In a 2010 interview with the Bristol Evening Post, Rosevink stated that he was convinced of the veracity of the German account.
The following day, a search of the Bay of Biscay was undertaken by "N/461", a Short Sunderland flying boat from the Royal Australian Air Force's 461 Squadron. Near the same coordinates where the DC-3 was downed, the Sunderland was attacked by eight V/KG40 Ju 88s and after a furious battle, managed to shoot down three of the attackers, scoring an additional three "possibles," before crash-landing at Penzance. In the aftermath of these two actions, all BOAC flights from Lisbon were subsequently re-routed and operated only under cover of darkness. [N 8] [N 9]
Theories for the attack
There are several theories as to why BOAC Flight 777 was shot down by the German pilots. All of these contradict the claims by the German pilots that they were not ordered to shoot down the airliner, either because the theories were formulated before the testimonies of the German pilots were recorded in the 1990s, or because the authors disbelieve the German accounts.
Churchill assassination attempt
The most popular theory surrounding the downing of BOAC Flight 777 is that German intelligence mistakenly believed Winston Churchill was on the flight. This theory appeared in the press within days of the incident, and is supported by Churchill himself. In late May 1943, Churchill and Foreign Secretary Anthony Eden travelled to North Africa for a meeting with United States general Dwight D. Eisenhower.
The German government was eager to assassinate Churchill on his return flight home, and monitored flights in and out of the region in case the Prime Minister tried to sneak home aboard a civilian airliner. This scenario was plausible as Churchill flew to Britain from Bermuda in January 1942 aboard a scheduled commercial airline flight. Rumors circulated since early May that Churchill might fly home from Lisbon. Some have speculated that these rumours were planted by Britain's Secret Intelligence Service to mask Churchill's travel itinerary.
According to the Churchill assassination theory, as passengers were boarding BOAC Flight 777, German agents spotted what Churchill described in his memoirs as "a thick-set man smoking a cigar", whom they mistook for the Prime Minister. This man was later identified as Alfred T. Chenhalls, Howard's accountant and portly travel companion. In addition, some have speculated that the tall and thin Howard may have been mistaken for Detective Inspector Walter H. Thompson, Churchill's personal bodyguard who had a similar physical appearance. There is an even more elaborate version of this theory that posits Chenhalls was employed by the British government as Churchill's "deliberate double" and that he and Howard boarded BOAC Flight 777 knowing they were going to die. An alternative version of this is that the British government had intercepted German messages via the Ultra code breaking operations, but failed to notify the BOAC Flight 777 for fear of compromising the use of Ultra decrypted messages. Both Flight 777 (1957), a book by Ian Colvin about the incident, and In Search of My Father (1981), by Leslie Howard's son Ronald Howard, lend credence to the idea that BOAC Flight 777 was downed because the Germans thought Churchill was on the flight.
Churchill appeared to accept this theory in his memoirs, although he is extremely critical of the poor German intelligence that led to the disaster. He wrote, "The brutality of the Germans was only matched by the stupidity of their agents. It is difficult to understand how anyone could imagine that with all the resources of Great Britain at my disposal I should have booked a passage in an unarmed and unescorted plane from Lisbon and flown home in broad daylight." As it was, Churchill travelled back to Britain via Gibraltar, departing on the evening of 4 June 1943 in a converted Consolidated B-24 Liberator transport and arriving in Britain the next morning.
In the BBC television series, Churchill's Bodyguard (original broadcast 2006), it is suggested that (Abwehr) German intelligence agents were in contact with members of the merchant navy in Britain and were informed of Churchill's departure and route. German spies watching the airfields of neutral countries may have mistaken Howard and his manager, as they boarded their aircraft, for Churchill and his bodyguard. Churchill's Bodyguard noted that Thompson wrote that Winston Churchill at times seemed clairvoyant about suspected threats to his safety, and acting on a premonition, he changed his departure to the following day. The crux of the theory posited that Churchill asked one of his men to tamper with an engine on his aircraft, giving him an excuse not to travel at that time. Speculation by historians has also centred on whether the British code breakers had decrypted several top secret Enigma messages that detailed the assassination plan. Churchill wanted to protect any information that was uncovered by the code breakers so that the Oberkommando der Wehrmacht would not suspect that their Enigma machines were compromised. Although the overwhelming majority of published documentation of the case repudiates this theory, it remains a possibility. Coincidentally, the timing of Howard's takeoff and the flight path was similar to Churchill's, making it easy for the Germans to mistake the two flights.
Leslie Howard: Spy
Several exhaustively researched books focused on Flight 777, including Flight 777 (Ian Colvin, 1957) and In Search of My Father: A Portrait of Leslie Howard (Ronald Howard, Leslie's son, 1984), conclude that the Germans were almost certainly out to shoot down the DC-3 to kill Howard himself. Howard had been travelling through Spain and Portugal, ostensibly lecturing on film, but also meeting with local propagandists and shoring up support for the Allied cause. The Germans in all probability suspected even more surreptitious activities since German agents were active throughout Spain and Portugal, which, like Switzerland, was a crossroads for persons from both sides of the conflict, but even more accessible to Allied citizens. James Oglethorpe, a British historian specialising in the Second World War, has investigated Leslie's connection to the secret services. Ronald Howard's book, in particular, explores in great detail written German orders to the Ju 88 Staffel based in France, assigned to intercept the aircraft, as well as communiqués on the British side that verify intelligence reports of the time indicating a deliberate attack on Howard. These accounts also indicate that the Germans were aware of Churchill's whereabouts at the time and were not so naïve as to believe he would be travelling alone on board an unescorted and unarmed civilian aircraft, which Churchill also acknowledged as improbable. Howard and Chenhalls were not originally booked on the flight, and used their priority status to have passengers removed from the fully booked airliner. Of the 13 travellers on board, most of them were either British executives with corporate ties to Portugal, or comparatively lower-ranked British government civil servants. There were also two or three children of British military personnel.
While ostensibly on "entertainer goodwill" tours at the behest of the British Council, Howard's intelligence-gathering activities had attracted German interest. The chance to demoralise Britain with the loss of one of its most outspokenly patriotic figures, may have been behind the Luftwaffe attack. Ronald Howard was convinced the order to shoot down Howard's airliner came directly from Joseph Goebbels, Minister of Public Enlightenment and Propaganda in Nazi Germany, who had been ridiculed in one of Howard's films and who believed Howard to be the most dangerous British propagandist. A 2008 book by Spanish writer José Rey Ximena claims that Howard was on a top-secret mission for Churchill to dissuade Francisco Franco, Spain's authoritarian dictator and head of state, from joining the Axis powers. Via an old girlfriend (Conchita Montenegro), Howard had contacts with Ricardo Giménez-Arnau, who at the time was a young and very humble diplomat in the Spanish Ministry of Foreign Affairs. Further circumstantial background evidence is revealed in Jimmy Burns's 2009 biography of his father, spymaster Tom Burns. According to author William Stevenson in A Man called Intrepid, his biography of Sir William Samuel Stephenson (no relation), the senior representative of British Intelligence for the western hemisphere during the Second World War, Stephenson postulated that the Germans knew about Howard's mission and ordered the aircraft shot down. Stephenson further claimed that Churchill knew in advance of the German intention to shoot down the aircraft, but decided to allow it to proceed to protect the fact that the British had broken the German Enigma code.[N 10]
Assassination of Leslie Howard, the propaganda figure
The theory that Leslie Howard was targeted for assassination because of his role as an anti-Nazi propaganda figure is supported by journalist and law professor Donald E. Wilkes Jr. Wilkes writes that Joseph Goebbels could have orchestrated the downing of BOAC Flight 777 because he was "enraged" by Howard's propaganda and was Howard's "bitterest enemy". The fact that Howard was Jewish would only further buttress this theory. In fact, Germany's propaganda machine boasted at Howard's death and Joseph Goebbels' propagandist newspaper Der Angriff ("The Attack") ran the headline "Pimpernel Howard has made his last trip", which was a reference to both the 1934 movie The Scarlet Pimpernel where the actor played a mysterious British hero who secretly saved French citizens from the Reign of Terror and the 1941 offshoot film Pimpernel Smith that starred Howard as a professor who rescues victims of Nazi persecution.
Howard mistaken for R. J. Mitchell
One of the less credible theories that circulated at the time was reported by Harry Pusey. Before the attack on BOAC Flight 777, the film The First of the Few about the life of R. J. Mitchell, the engineer behind the Supermarine Spitfire, was playing widely in Lisbon cinemas and had starred Howard as Mitchell. The gossip on the streets of Lisbon was that German agents had mistakenly thought Howard was Mitchell and ordered the downing of BOAC Flight-777. Pusey debunked this theory: "But you would have thought someone in German Intelligence would have known that Mitchell had died in 1937, wouldn't you?"
The 2010 biography by Estel Eforgan, Leslie Howard: The Lost Actor examines currently available evidence and concludes that Howard was not a specific target, corroborating the claims by German sources that the shooting down was "an error in judgement".
Legacy of the disaster
The downing of BOAC Flight 777 elicited headlines around the world and there was widespread public grief, especially for the loss of Leslie Howard, who was championed as a martyr. The British government condemned the downing of BOAC Flight 777 as a war crime. The public's attention shifted focus as other events occurred. Nonetheless, two authoritative works examined the circumstances of the downing of BOAC Flight 777: in 1957, journalist Ian Colvin's book on the disaster entitled Flight 777: The Mystery of Leslie Howard and in 1984, Howard's son, Ronald Howard, wrote a biography of his father, including an account of his father's death.
In 2003, on the 60th anniversary of the downing of Flight 777, a pair of television documentaries on the subject were released: the BBC series Inside Out and the History Channel's Vanishings! Leslie Howard – Movie Star or Spy?.
In 2009 the grandson of Ivan Sharp, who lives in Norwich and has the same name as his grandfather, arranged for a memorial plaque for the crew and passengers of BOAC Flight 777 to be dedicated at Lisbon Airport. On 1 June 2010, a similar plaque, paid for by Sharp, was unveiled at Whitchurch Airport in Bristol and a brief memorial was held by friends and family of those killed on the flight.
A documentary film Leslie Howard: A Quite Remarkable Life (2009), which includes commentary on the ill-fated flight, was narrated by Derek Partridge, who at the age of seven gave up his seat on BOAC Flight 777 for Leslie Howard and Alfred T. Chenhalls and later in life, became a television and screen actor.
- "Souls on board" is an aviation term referring to the total complement of passengers and crew.
- Initially, a British copilot (carrying a concealed firearm) was included in the crew.
- Crew aboard on 15 November 1942 were: Captain Theo Verhoeven, first officer Capt. Dirk de Koning, flight engineer Gerard Alsem and radio operator Leo Dik.
- Squadron Leader Wally Lashbrook's Handley Page Halifax bomber was shot down over Belgium in April 1943, and he managed to evade capture, escaping to Portugal.
- Although scheduled for a 07:30 takeoff, the flight was delayed when Leslie Howard retrieved an item from Customs. The flight departed at 07:35 GMT.
- Annette Sutherland Burr does not appear on any of the published passenger lists and the names of all 17 passengers and crew are known.
- Within the British National Archives there is correspondence between Howard and Eden regarding his trip to Spain.
- Ostensibly on a long range anti-submarine patrol, the crew of "N/461" received information about the downing of BOAC Flight 777 but were not specifically searching for survivors.
- V/KG40 regarded the action on 2 June 1943 as successful despite the evidence that three Ju 88s and possibly six had been downed. The Sunderland flying boat was severely damaged and gunner Sgt. Miles was killed during the exchange.
- There has also been speculation that passengers Shervington, Stonehouse and Sharp, among others, were spies for the British.
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- Traição a Salazar by José Antonio Barreiros; published by Oficina do Livro (June 2012), page 69
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- Churchill, Winston S. The Hinge of Fate. New York: Houghton-Mifflin, 1950.
- Churchill, Winston. Memoirs of the Second World War: An Abridgement of the Six Volumes of the Second World War. New York: Houghton Mifflin Books, 1991. ISBN 0-395-59968-7.
- Colvin, Ian. Admiral Canaris: Chief of Intelligence. London: Colvin Press, 2007. ISBN 978-1-4067-5821-4.
- Colvin, Ian. Flight 777: The Mystery Of Leslie Howard. Barnsley, South Yorkshire, UK: Pen & Sword Aviation, Updated edition, 2013. First edition, London: Evans Brothers, 1957. ISBN 978-1-7815-9016-4.
- Eforgan, Estel. Leslie Howard: The Lost Actor. London: Vallentine Mitchell Publishers, 2010. ISBN 978-0-85303-941-9.
- Goss, Chris. Bloody Biscay: The Story of the Luftwaffe's Only Long Range Maritime Fighter Unit, V Gruppe/Kampfgeschwader 40, and Its Adversaries 1942–1944. London: Crécy Publishing, 2001. ISBN 0-947554-87-4.
- Hagens, Jan. Londen of Berlijn: De KLM en haar personeel in oorlogstijd, Deel 1, 1939–1941 (in Dutch). Bergen, The Netherlands: Bonneville, 2000. ISBN 90-73304-74-1.
- Hill, Ona L. Raymond Burr: A Film, Radio and Television Biography. New York: Hill McFarland & Company, 1999. ISBN 0-7864-0833-2.
- Howard, Leslie Ruth. A Quite Remarkable Father: A Biography of Leslie Howard. New York: Harcourt Brace and Co., 1959.
- Howard, Ronald. In Search of My Father: A Portrait of Leslie Howard. London: St. Martin's Press, 1984. ISBN 0-312-41161-8.
- Macdonald, Bill. The True Intrepid: Sir William Stephenson and the Unknown Agents. Vancouver, BC: Raincoast Books 2002, ISBN 1-55192-418-8.
- Rey-Ximena, José. El Vuelo de Ibis [The Flight of the Ibis] (in Spanish). Madrid: Facta Ediciones SL, 2008. ISBN 978-84-934875-1-5.
- Rosevink, Ben and Lt Col Herbert Hintze. "Flight 777." FlyPast, Issue No. 120, July 1991.
- Southall, Ivan. They Shall Not Pass Unseen. London: Angus and Robertson, 1956.
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- Interview with Mrs Jean Pratten, a personal friend of captain Quirinus Tepas 'Remembering Quirinus Tepas'
- Inside out documentary on BOAC Flight 777
- The History Channel – VANISHINGS: Leslie Howard – Movie Star Or Spy?
- KLM/BOAC DC-3 G-AGBD on far left, rest BOAC lend-lease Dakotas/Liberators at Portela, c. October 1943
- Two KLM/BOAC DC-3s at Portela Airport, c. 1943
- Lufthansa DC-3 between Portuguese and Spanish Airliners Portela, c. 1943
- Damage foto's of the G-AGBB after the 15 november 1942 attack at a (dutch) aviation history site.