411A said...
A few early heavy jet transports (707, DC-8's) found the problem with engines (Pratt&Whitney JT4A) that would get 'em to high altitude, only to find that the maneuvering margin was very low.
Aviate added...
The early Lear Jets [ in the hands of almost untrained, wealthy private owners ] sometimes wound up on the Far Side and no prisoners were taken! With the excess power available it would get to Vne and beyond in straight and level flight very quickly. Flying by the Numbers really meant what it said.
Aviate 1138