Your all wrong.
The fastest certified subsonic aircraft is the 727. Flight test all the way to Mach .98 Designed to cruise effortlessly at Mach .92 but then came the 70s gas crunch and everybody throttled them back and they never went back up.
The 727 is the last Boeing design that came from the guys that really knew how to build an airplane. Since then they are good airplanes, but not as good as before.
