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Altitude shown on the altimeter
Height above mean sea level (MSL)
Height above ground level (AGL)
Indicated altitude when an altimeter is set to 29.92 in Hg. Primarily used in aircraft performance calculations and in high-altitude flight.
Pressure altitude corrected for nonstandard temperature variations
Class A airspace
18,000 - 60,000 ft
Class D airspace
In the shape of a can around an airport; Surface to 2,500 ft; Extends 4 nm;
Class C Airspace
Solid purple line; Surface to 4,800 ft (5nm) and 1,200-4,800 ft (10nm); Comprised of primary, outer circle, and outer area
Class B airspace
Upside down wedding cake; SF to 10,000 ft MSL and ~25-30 mile radius around airport
Class E airspace
Always starts at 14,500 ft MSL to 18,000 (in CONUS); Extends down to 1,200 ft AGL; Coastal water out to 12 nm
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