Italian Co-Belligerent Air Force
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The Italian Co-Belligerent Air Force (Aviazione Cobelligerante Italiana, or ACI), or Air Force of the South (Aeronautica del Sud), was the air force of the Royalist "Badoglio government" in southern Italy during the last years of World War II. The ACI was formed in southern Italy in October 1943 after the Italian Armistice in September. As by this point the Italians had defected from the Axis and had declared war on Germany, the ACI pilots flew for the Allies.
A small part of the Italian Royal Air Force (Regia Aeronautica) remained under German control. This was known as the National Republican Air Force (Aeronautica Nazionale Repubblicana, or ANR), ostensibly part of the forces of the Benito Mussolini's Fascist state in northern Italy, the Italian Social Republic (Repubblica Sociale Italiana). The ANR pilots flew with the Axis.
By the end of 1943, 281 Italian warplanes had landed at Allied airfields, but most were no longer useful for combat. The crews of these aircraft were re-equipped with Allied aircraft and engaged in transport, escort, reconnaissance, sea rescue, and limited tactical ground support operations flying 11,000 missions from 1943 to 1945.
The ACI never operated over Italian territory, its objectives being always in the Balkans (Yugoslavia or Albania). This was to avoid any possible encounter between Italian-manned aircraft fighting on opposite sides. During the entire history of ICA, no encounter, let alone combat, was ever reported between ACI and ANR aircraft.
The ACI formed the basis of the post-war Air Force of the Italian Republic (Aeronautica Militare Italiana).
- 2°Gruppo, 3°Stormo Trasporto, Aeronautica Cobelligerante del Sud, Lecce-Galatina, Southern Italy, November 1944
- 10°Gruppo, 4°Stormo, Aeronautica Cobelligerante del Sud, Lecce-Galatina (Bell Aircobra)
- 20°Gruppo, 51°Stormo, Aeronautica Cobelligerante del Sud, Leverano (Spitfire)
- 28°Gruppo, Stormo Baltimore, Southern Italy (Martin Baltimore)
Notable members 
- Carlo Emanuele Buscaglia
- Alberto Veronese
- Teresio Martinoli
- Rodolfo Daniel Martinez Didolich
- Duilio Fanali
- Carlo Negri
- Vittorio Sanseverino
- Ambrosini SAI.2S
- AVIA FL.3
- Breda Ba.25
- Breda Ba.39
- Bell P-39Q Airacobra
- Bell P-39N Airacobra
- CANT Z.501 Gabbiano
- CANT Z.506B Airone
- CANT Z.1007bis Alcione
- CANT Z.1018 Leone
- Caproni Ca.133
- Caproni Ca.164
- Caproni-Bergamaschi Ca.310 Libeccio
- Fiat BR.20M Cicogna
- Fiat CR.32bis
- Fiat CR.42 AS Falco
- Fiat G.8
- Fiat G.12T
- Fiat G.50bis Freccia
- Fiat RS.14B
- Martin A-30 Baltimore III
- Macchi MC.200 Saetta
- Macchi MC.202 Folgore
- Macchi MC.205V Veltro
- Nardi FN.305
- Reggiane Re.2001 Serie III Falco II
- Reggiane Re.2002 Ariete
- SAIMAN 200
- SAIMAN 202
- Savoia-Marchetti SM.75 Marsupiale
- Savoia-Marchetti SM.79 Sparviero
- Savoia-Marchetti SM.81 Pipistrello
- Savoia-Marchetti SM.82
- Savoia-Marchetti SM.84
- Spitfire LF.Mk.VB
See also 
- Military history of Italy during World War II
- Pietro Badoglio
- Regia Aeronautica (Italian Royal Air Force 1923-1943)
- Aeronautica Nazionale Reppublicana (Pro-Axis Air Force 1943-1945)
- Aeronautica Militare (Post-war Italian Air Force 1945–present)
- Italian Co-Belligerent Navy
- Italian Co-Belligerent Army
- D'Amico, F. and G. Valentini. Regia Aeronautica Vol. 2: Pictorial History of the Aeronautica Nazionale Repubblicana and the Italian Co-Belligerent Air Force, 1943-1945. Carrollton, Texas: Squadron/Signal Publications, Inc., 1986. ISBN 0-89747-185-7.
- Mattioli, Marco. Bell P-39 Airacobra in Italian Service, Aviolibri Special 7 (Bilingual Italian/English). Roma, Italia: IBN Editore, 2003. ISBN 88-86815-85-9.
- Sgarlato, Nico. Italian Aircraft of World War II. Warren, Michigan: Squadron/Signal Publications, Inc., 1979. ISBN 0-89747-086-9.