Keywords: aviation aircraft airplane seaplane biplane flying boat flyingboat naval aviation navalaviation united states navy unitedstatesnavy us navy usnavy usn boeing boeing xpb boeingxpb xpb boeing xpb-1 boeingxpb1 xpb-1 xpb1 packard packard 2a-2500 packard2a2500 2a-2500 2a2500 prototype military aviation militaryaviation buno a-6881 bunoa6881 a-6881 a6881 boeing model 50 boeingmodel50 boeing 50 boeing50 packard motors packardmotors boeing pb boeingpb boeing pb-1 boeingpb1 pb-1 pb1 blackandwhite monochrome vehicle black and white From SDASM's History of Naval Aviation Collection Repository: San Diego Air and Space Museum Archive From SDASM's History of Naval Aviation Collection Repository: San Diego Air and Space Museum Archive |