Boeing 7J7
 The Boeing 7J7 was a short- to medium-range airliner proposed by the United States aircraft manufacturer Boeing in the 1980s. It would have carried 150 passengers and was touted as the successor to the successful Boeing 727. It was initially planned to enter service in 1992. This was intended as a highly fuel-efficient aircraft employing new technologies but it was cancelled when the price of oil dropped during the 1980s.