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.
1. imposing in size or bulk or solidity. 2. being the same substance throughout. 3. imposing in scale or scope or degree or power. 4. consisting of great mass; containing a great quantity of matter. Familiarity information: MASSIVE used as an adjective is uncommon.