At cruise altitude (35,000-40000 feet) it goes at Mach 0.85 (that is to say, 85% of the speed of sound) which translates in a ground speed of about 570 mph or 915 km/h, but it can go as fast as Mach 0.92 (614 mph, 988 km/h) should the need arise.
â¢ VAST (adjective). The adjective VAST has 1 sense: 1. unusually great in size or amount or degree or especially extent or scope. Familiarity information: VAST used as an adjective is very rare.
Massive means enormous. Obviously, Mt. Everest is massive, but a massive budget cut isn't necessarily big in physical mass; it's something that is imposing in scale or power. A massive budget cut can do a lot of damage. Unless someone is referring to your intellect, massive is not a word you want used in a description of your attributes. Massive is a nice one to trot out when huge, gigantic, and enormous sound too over-the-top.