Marka la eego qaybta hoose ka dibna ka jawaab su'aasha ka dib luqadda la mid ah sida marinka: Passage: In 1934, United States Army Air Corps soo saaray codsi loogu talagalay bomber la laba jibbaar load bamka iyo kala duwan ee Martin B-10, taas oo ahaa kaliya soo galaya adeegga sida bomber caadiga ah ee ciidamada. In qiimaynta ee Wright Field ee sanadka soo socda, Douglas tusay ay DB-1.
Boeing Model 299 (oo markii dambe loo sameeyay Boeing B-17 Flying Fortress) iyo Martin Model 146