Aircrew flight operation/cruising guide cards for the USAAF P-38 J (Lockheed 'Lighting') aircraft. Information based on T.O. 01-75-1, August 1944. Set of 4 plastic cards approximately 14 x 8cm. These appear to have information about the aircraft's engines pertaining to different scenarios such as the loading weight of the aircraft, having one engine propellor feathered, fitted with wing fuel tanks etc. They have information on RPM limits, climb data, maximum range and so on, Probably carried on the aircraft to be used as an aide-memoire. The cards are in excellent condition and come in the original paper envelope. Stock code P20306.