Aircraft › P-39Airacobra IAiracobra IAiracobra IModification ofP-39ChangesRAF export version with the V-1710-E4: one 20 mm Hispano, two .50 in and four .303 in. No. 601 Squadron flew its only RAF operation on 9 October 1941.Crew1Engines1Service193119321933193419351936193719381939194019411942194319441945United Kingdom · Western Europe9 Oct 1941 – 9 Oct 1941