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At higher altitudes, such as 30,000 feet where the air is significantly thinner, an airplane can cruise effortlessly at speeds exceeding 500 miles per hour, as it faces much less atmospheric resistance. However, as an aircraft begins to descend, it enters increasingly denser air which imposes limitations on speed. Below 10,000 feet, a maximum speed ceiling known as Maximum Operating Velocity (VMO) becomes crucial. For instance, a Boeing 767 has a VMO of approximately 414 mph, while a Boeing 757 operates with a VMO of about 402 mph. Exceeding these speeds, particularly in dense air, can lead to dangerous aerodynamic phenomena known as "flutter."