Boeing 314 Yankee Clipper 1939 The apex of flying boat design was the Boeing B-314. Sometimes known as the Yankee Clipper or Dixie Clipper type, the luxurious B-314 provided the first scheduled heavier-than-air passenger service across the Atlantic ocean. This Pan American World Airways Boeing 314 Yankee Clipper (serial NC18603), circa 1939. This aircraft started the Transatlantic mail service. It crashed in Lisbon, Portugal, on 22 February 1943 and was written off.