Wow! Forty years for the 757. Hard to believe. Seems so recent that I was ORD ATC and working the day the first one flown by an airline, can’t remember which, made its first revenue flight off ORD. There were Boeing and the airline representatives in the tower and Tracon to watch its departure. About 20 miles out it had to shut down an engine and return. Darn. But…it went on to have many happy years of success.