AVRO 691 LANCASTRIAN - Following development of the Lancaster XPP for TCA, six more Lancaster Mk Xs were more extensively converted with elongated nose and tail cones, 3'/2-ton (3 560-kg) mail capacity, windows in the rear fuselage and ten passenger seats. Operated by TCA on North Atlantic route, 1944/45, and known as Lancastrians.

Avro Lancastrian C Mk I: Basic Lancaster I airframe adapted for transport duties to Specification 16/44, similar to Victory Aircraft conversion in Canada. Nine passengers, plus freight and mail. 1,635 hp Merlin T.24/2 engines. Twenty-three built, 1944/45, on RAF contract and transferred to BOAC for operation on UK-Australia route, commencing May 31, 1945. Subsequent marks built post-war.