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In aviation and aviation meteorology, a flight level ( FL) is an aircraft's altitude at standard air pressure, expressed in hundreds of feet.
flight level (plural flight levels) Any of several internationally agreed standard altitudes that are based on atmospheric pressure rather than on true height. ( aviation) a pressure altitude measured in terms of hundreds of feet above sea level (ie. flight level 120 (FL120) is 12,000 ft. ASL)
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