Boeing XB -38 Flying Fortress powered by 4x Allison V-1710 Top Boeing XB -38 Flying Fortress, powered by 4x Allison V-1710 Top Boeing XB -38 Flying Fortress (1943) Boeing XB -38 Flying Fortress (1943) The big XB-15 was designed as a long-range bomber originally named XBLR-1. This was a bold attempt... The big XB-15 was designed as a long-range bomber, originally named XBLR-1. This was a bold attempt,... Boeing XB-39 (Spirit of Lincoln) (1944) Boeing XB-39 (Spirit of Lincoln) (1944) U.S.A.A.F. bomber U.S.A.A.F. bomber Boeing B-17 Flying Fortress: The XB-17 crashed during its test flight at Wright Field on Oct. 30... Boeing B-17 Flying Fortress: The XB-17 crashed during its test flight at Wright Field on Oct. 30,... Variant Variant
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