飞航空层 Flight level
（重定向自Transition Altitude）
飞航空层（英文：flight level，缩写 FL），或称飞航空层高度，是由一标准大气压（1013.25毫巴, 76公分水银柱）所推算出来的飞行高度，所以此高度不一定是航空器的真正的海拔高度。
Transition Altitude
中文百科
英语百科
Flight level 飞航空层
（重定向自Transition Altitude）
In aviation and aviation meteorology, a flight level (FL) is defined as a vertical profile of airspace at standard pressure, expressed as a nominal altitude in hundreds of feet. The pressure is computed assuming an International standard sea-level pressure datum of 1013.25 hPa (29.92 inHg), 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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