In the late 2000s to early 2010s, rising fuel prices coupled with economic crisis resulted in cancellation of many ultra-long haul non-stop flights. As fuel prices fell and aircraft became more economical the economic viability of ultra long haul flights improved.
Direct flight and Non-stop flight often are confused with each other. Starting March 31, 2019 American Airlines started offering non-stop flights from Phoenix, Arizona to London, England  meaning that the plane leaves Phoenix Sky Harbor International Airport and lands at Heathrow Airport. Whereas a Direct flight simply would mean that the passengers would not have to get off the plane but the plane could stop between the two cities.
- "From Newark Over the North Pole". New York Times. 30 March 2001. Retrieved 1 April 2016.
- A new era of 'ultra-long-haul' aviation
- "American Airlines first flight between Phoenix and London takes off". Chamber Business News. 1 April 2019. Retrieved 1 April 2019.