Flight Level (FL)
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Definition
A standard altitude reference based on a fixed pressure setting of 29.92 inHg (1013.25 hPa)
Related Terms
Airspace Classification
The system dividing airspace into classes (A through G) with different rules and requirements
Cruise
The phase of flight at a relatively constant altitude and speed between climb and descent
QNH (QNH)
The atmospheric pressure adjusted to mean sea level, used for altimeter setting
Service Ceiling
The maximum altitude at which an aircraft can sustain a specified rate of climb
Transition Altitude (TA)
The altitude at which aircraft change from local altimeter settings to standard pressure
Mentioned In
How Air Traffic Control Works: Keeping Skies Safe
…of "go down," the instruction is "descend and maintain flight level three five zero." All altitude clearances, headings, and…
Why Do Planes Fly at 35,000 Feet? The Science of Cruise Altitude
…permits. A flight from Singapore to London might start at Flight Level 310 (31,000 feet), step to 350, then 390 over the 13-hour…
What Really Happens During Turbulence
Supersonic Flight: Concorde and the Future
Contrails and Climate: The Hidden Impact
Why Flying Higher Saves Fuel
…assigns specific flight levels to specific tracks, and the flight level allocation may not coincide with an individual aircraft's…