Nobody knew if the 707 would make money. Back then, Boeing was making almost all of its money from military planes. 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. In a demonstration flight over Lake Washington outside of Seattle, on August 7, 1955, test pilot Tex Johnston performed a barrel roll in the 367-80 prototype.