The Bell P-39 �Airacobra� had been one of the principal fighter aircraft in service with US forces in the beginning of World War II. It had been build by the Bell Aircraft Corporation. Its maiden journey was in April 1939. The aircraft's uncommon design showcased an Allison engine mounted in the center of the fuselage, just behind the pilot, driving the propeller through a driveshaft moving between the pilot's feet. A 37 mm T9 cannon fired through center associated with the propeller hub. Entry toward cockpit ended up being through a side door.A Total of 9,584 examples were produced, with more than half being sent to the Soviet Union in lend-lease system.