Each is stated in three digits that represent hundreds of feet. For example, flight level (FL) 250 represents a barometric altimeter indication of 25,000 feet; FL 255, an indication of 25,500 feet. (See ICAO term FLIGHT LEVEL.)
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Reduced vertical separation minimum (RVSM) is the reduction, from 2,000 feet to 1,000 feet, of the standard vertical separation required between aircraft flying between flight level 290 (29,000 ft) and flight level 410 (41,000 ft).
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A: No commercial or business airplane flying today can exceed 100,000 feet. Special rocket-powered airplanes can fly over 100,000 feet to gather data, but they are specially designed for it.
The biggest reason for flying at higher altitudes lies in fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak.
Therefore, routes are often broken up using smaller aircraft along the way. Altogether, commercial airliners have the physical capability to travel up to 43,000 feet.
How high can you fly in a Cessna 172? Modern Cessna 172's have a maximum altitude of 13,000ft - 15,000ft. Anything over 10,000ft is known as the transition layer, and pilots should not cruise above this altitude. For long haul flights, it's recommended to cruise at 9,500ft and 4,500ft for short flights.