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The Boeing 747-300 flies at a speed of 515 Knots or 620 miles per hour. However, to assure the best lift to drag ratio, the Boeing 747-300 flies at a Mach number of .85 which is 85% of the speed of sound. The speed of sound is determined by the density of the air. Therefore, the speed of sound is less as the aircraft climbs to a higher altitude. How do I know all this. Well, I am a Boeing 747-300 Captain with Saudi Arabian Airlines.

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