The Boeing Company invested $16 million (two-thirds of the company's net profits from the post-war years) to build the Dash 80 prototype for a long-range jet aircraft. It was developed in secrecy and designated Model 367-80 to disguise it as merely an improved version of the C-97 Stratofreighter. It had jet engines and swept wings, and was very different from the straight-wing, propeller-powered Stratofreighter.