Electronic Warfare and Radar Systems Engineering Handbook - Mach Number and Airspeed vs. Altitude Mach Number - RF Cafe
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SOLVED: A certain aircraft flies at the same Mach number regardless of its altitude. Compared to its speed at 12,000-m standard altitude, it flies 127 km / h faster at sea level.
Electronic Warfare and Radar Systems Engineering Handbook - Mach Number and Airspeed vs. Altitude Mach Number - RF Cafe