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.
Synonym Discussion of huge. enormous, immense, huge, vast, gigantic, colossal, mammoth mean exceedingly large. enormous and immense both suggest an exceeding of all ordinary bounds in size or amount or degree, but enormous often adds an implication of abnormality or monstrousness. an enormous expense; an immense shopping mall; huge commonly suggests an immensity of bulk or amount. incurred a huge debt; vast usually suggests immensity of extent.