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trees and plane - Jumbo jet plane landing at Fukuoka International Airport
Modern airliners cruise at speeds of 0.75 to 0.85 Mach, or 75% to 85% of the speed of sound (420 to 580 mph/ 680-900 km/h). The speed of sound predominantly depends on air temperature (hardly at all on pressure), so the Mach number for the speed of a jet also varies with atmospheric conditions.
The Boeing 747 was the original jumbo jet. The 747 was the first wide-body airliner, first to use the twin-aisle concept, and the first airliner to use high bypass turbofan engines. Major features are:
triple decks - the lowest used by some airlines for galleys as well as cargo
distinctive profile - the hump over the forward fuselage makes this airliner easily distinguishable from others.