Keywords: Boeing pb 1.jpg A U S Navy PB-1 Boeing Model 50 patrol plane 1925 The PB designation was first used for the Boeing model 50 flying boat which was built in 1925 for a nonstop flight to Hawaii The US Navy had designated the aircraft PB-1 and given it serial A6881 The designation PB was the used again for the US Navy version of the B-17 Flying Fortress On 31 July 1945 the US Navy ordered a single B-17F from the USAAF production line with the designation PB-1 and the BuNo 34106 Former B-17Gs were converted for the US Coast Guard as PB-1Gs and for the USN as PB-1Ws LOC-image ggbain 38499 1925 Bain News Service PD-Bain frame removed PD-USGov Boeing Model 50 |