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.
adjective huge, massive, vast, enormous, immense, titanic, gigantic, monumental, monstrous, mammoth, mountainous, stellar (informal), prodigious, gargantuan, fuck-off (offensive taboo slang), herculean, elephantine, ginormous (informal), humongous or humungous (U.S. slang) A colossal statue stands in the square.