5 decal variants:
1. P-39 L-1 of the 81st Fighter Group in Tunisia in late 1943
2. P-39 N-1, 12. Gruppo, 4. Stormo Co-Belligerent Force, Italy 1944
3. P-39 N of 9. GIAP, personal aircraft of Kpt. S. Achmet-Chan
4. P-39 N-2, 118th, Lt. E.J. Davis, Chartollote, N. Caroline, 1943
5. P-39 N-5, 1st Esq. GC 1/4 Navarre, La Mediouna, Marocco, July 1943
Other major users of the type include the Free French, the Royal Air Force, the United States Army Air Forces, and the Italian Co-Belligerent Air Force. Designed by Bell Aircraft, it had an innovative layout, with the engine installed in the center fuselage, behind the pilot, and driving a tractor propeller via a long shaft. It was also the first fighter fitted with a tricycle undercarriage. Although its mid-engine placement was innovative, the P-39 design was handicapped by the absence of an efficient turbo-supercharger, limiting it to low-altitude work. Together with the derivative P-63 Kingcobra, the P-39 was one of the most successful fixed-wing aircraft manufactured by Bell.