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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.
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1811: Jonathan Scott (1754–1829), an Englishman who learned Arabic and Persian in India, produces an English translation, mostly based on Galland's French version, supplemented by other sources. Robert Irwin calls it the "first literary translation into English", in contrast to earlier translations from French by "Grub Street hacks".
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A Flight Level ( FL) is a standard nominal altitude of an aircraft, in hundreds of feet. This altitude is calculated from a world-wide fixed pressure datum of 1013.25 hPa (29.921 inHg ), the average sea-level pressure, and therefore is not necessarily the same as the aircraft's true altitude either above mean sea level or above ground level.
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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)
