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SESK: Stuff Everyone Should Know · sesk.info/drone-class-c-typical-shape

How high does Class C airspace usually extend above its airport?

It usually reaches 4,000 feet above airport elevation.

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  1. 4,000 feet above airport elevation ✔
  2. 2,500 feet above ground everywhere
  3. 10,000 feet above sea level everywhere

Why: Class C areas are individually tailored, but the usual top is 4,000 feet above airport elevation. The typical shape has a 5 NM core and a 10 NM shelf.

Huh, didn't know that: Class C airports have an operating control tower and radar approach control.

The dad joke
Why did Class C bring a shelf? It needed room for more airspace.
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References

Answer: 4,000 feet above airport elevation. Class C areas are individually tailored, but the usual top is 4,000 feet above airport elevation. The typical shape has a 5 NM core and a 10 NM shelf.

  1. FAA Remote Pilot Study Guide www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/remote_pilot_study_guide.pdf
    Class C airspace is generally airspace from the surface to 4,000 feet above the airport elevation
    Checked 2026-10-09.

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