The only Allied aircraft capable of carrying the 17-foot (5.2 m) long Thin Man or the 59-inch (150 cm) wide Fat Man was the British Avro Lancaster, but using a British aircraft would have caused difficulties with maintenance.
Det eneste allierede fly, som kunne bære den 5,1 meter lange Thin Man eller den 1,5 meter brede Fat Man var det britiske Avro Lancaster, men at bruge et britisk fly ville have afstedkommet problemer med vedligeholdelsen.