Answer: sprucegoose

AnswerCrossword Clue
SPRUCEGOOSEAircraft that flew only once, in California
SPRUCEGOOSEFlying boat built by Hughes Aircraft
SPRUCEGOOSEHughes Aircraft prototype
SPRUCEGOOSEUnexpected nickname of a Hughes Aircraft plane built mostly of birch
SPRUCEGOOSEFamed wooden flyer
SPRUCEGOOSEHughes aircraft
SPRUCEGOOSEMemorable Hughes plane
SPRUCEGOOSEHughes' wooden plane
SPRUCEGOOSEHuge Hughes airplane
SPRUCEGOOSEHoward Hughes's seaplane
SPRUCEGOOSEAttraction at the Evergreen Aviation Museum
SPRUCEGOOSEPlane that flew only once