Class C airspace surrounds mid-size airports with radar approach control -- think regional airports that handle a mix of commercial airline flights and general aviation. There are roughly 113 Class C airports in the United States. Flying a drone in Class C airspace without authorization is a federal violation under 14 CFR 107.41.
What makes Class C different from Class D -- and what most drone pilots get wrong -- is its shape, its extent, and the fact that it does not go away when the tower closes.
The Shape of Class C Airspace
Unlike Class D, which is a roughly uniform cylinder, Class C has two concentric rings:
Inner ring (surface area): Typically 5 nautical miles in radius, extending from the surface up to 4,000 feet AGL. This is where the primary airport operations are concentrated.
Outer ring (shelf area): Typically 10 nautical miles in radius, extending from 1,200 to 4,000 feet AGL. At the surface, this ring is not controlled airspace -- but above 1,200 AGL, it is.
For drone operations, which are typically conducted below 400 feet AGL, the outer ring is almost never a factor. Virtually all drone operations in Class C concern the inner ring -- the surface area within 5 NM of the airport.
The exact dimensions vary by airport and are shown on sectional charts. Some Class C airports have irregular shapes due to terrain, military operations, or adjacent Class D/E airspace.
How Authorization Works
LAANC (Low Altitude Authorization and Notification Capability) covers most Class C airports. The process is identical to Class D: use an approved UAS service supplier app, request authorization for your location and altitude, and receive near-real-time approval.
The UAS Facility Map for Class C airports shows the maximum altitude at which LAANC can approve a flight. Directly under the approach and departure paths, the ceiling may be 0 feet. Further from the runway, ceilings of 100-400 feet are common.
If LAANC is not available or your altitude exceeds the LAANC ceiling, you need a Part 107 waiver through the FAA's DroneZone portal.
The Key Difference From Class D: TRACON
This is what most drone content misses.
Class D airports have a control tower. Class C airports have both a control tower and a TRACON -- a Terminal Radar Approach Control facility. TRACON handles aircraft on instrument approaches and departures, often sequencing traffic from 20-50 miles out.
The implication for drone pilots: Class C airspace does not go away when the tower closes.
At a Class D airport, if the tower shuts down at 10 PM, the controlled airspace disappears and no authorization is required. At a Class C airport, TRACON continues to operate even after the tower closes. Class C airspace remains in effect as long as approach control is active -- which at most Class C airports is 24 hours a day.
Check the Chart Supplement entry for the specific airport. TRACON hours are listed separately from tower hours. If TRACON is operating, Class C airspace is active regardless of whether the tower light is on.
Traffic Patterns Near Class C Airports
The inner ring of a Class C airport will have significantly more manned aircraft traffic than a comparable Class D location. Instrument approaches, departures, and touch-and-go training all concentrate in the airspace above and around the inner ring.
Even with LAANC authorization, flying near a Class C airport requires heightened vigilance:
- Aircraft on IFR approaches may break out of clouds at or below 1,000 feet AGL on final approach
- VFR traffic patterns typically use 1,000 feet AGL for traffic pattern altitude
- At busy airports, traffic density may be high enough that visual detection of all aircraft is not reliable
This is not a reason to avoid Class C operations -- they are legal and common. It is a reason to keep your drone within easy visual reach, stay well below traffic pattern altitude, and be prepared to descend immediately.
Class C vs. Class B: How to Tell Them Apart
Pilots sometimes confuse Class C and Class B. The quick check:
Class B (the big commercial hubs -- LAX, JFK, ORD, ATL, DFW, etc.) is shown on sectional charts as solid blue lines forming the layered "wedding cake" structure. It extends from the surface in the innermost ring and has a 30 NM mode-C veil. Class B at the major hubs will have a LAANC ceiling of 0 feet within the inner ring -- no LAANC authorization possible, requires DroneZone waiver.
Class C is shown as solid magenta lines forming two concentric circles. There is no "wedding cake" -- just the inner and outer ring. LAANC is usually available.
On the airspace map in UAS SkyCheck, Class B is highlighted in blue and Class C in magenta. The result card shows the airspace class clearly and whether LAANC authorization is available for the specific location.
Practical Pre-Flight Checklist for Class C
Before flying in Class C:
- Confirm LAANC coverage -- check the UAS Facility Map at faadronezone.faa.gov or in a LAANC-enabled app.
- Obtain authorization -- do not fly until authorization is confirmed in your app.
- Check TRACON hours -- for the specific airport, confirm approach control is operating during your flight window if you are unsure.
- Check NOTAMs -- active NOTAMs may restrict or modify Class C operations.
- Check TFRs -- presidential, security, and event TFRs can temporarily overlay Class C airspace.
- Stay below your authorized altitude -- your LAANC authorization specifies a maximum altitude. Do not exceed it.
UAS SkyCheck surfaces airspace class, LAANC availability, active TFRs, and NOTAMs in a single preflight check. Free, no account required for the first check.
Common Mistakes at Class C Airports
Assuming the outer ring doesn't apply. At 400 feet AGL, you are below the shelf of the outer ring (which starts at 1,200 AGL) and technically in Class E or G depending on the location. But LAANC still only authorizes flights within the boundaries shown on the UAS Facility Map, which may extend into the outer ring area.
Flying without authorization because the tower looked closed. As described above, TRACON is separate from the tower. Confirm approach control status, not just tower status.
Relying on LAANC for time-sensitive operations without checking NOTAMs. LAANC authorization does not account for temporary NOTAMs. A NOTAM can override LAANC authorization for a specific area.
Assuming authorization covers adjacent restricted areas. Some Class C airports sit near Class B shelves, MOAs, or restricted areas. LAANC authorization covers the Class C designation only.