At the time , Boeing was making nearly all of its money from military contracts : Its last passenger transport , the Boeing 377 Stratocruiser , had netted the company a $ 15 million loss before it was purchased by the Air Force as the KC-97 Stratotanker .
The last airliner it made , the Boeing 377 Stratocruiser , lost the company $ 15 million before the United States Air Force bought some and called them the KC-97 Stratotanker .