Airspace Classes Explained: Entry, Equipment, Weather Minimums and Chart Depictions
What you'll learn: for each airspace class, what you need before entering as a VFR pilot, what equipment is required, the VFR weather minimums, and how it's drawn on a sectional. Prerequisites: MSL vs AGL, reading a METAR. Not a substitute for current charts.
Entry and equipment
| Class | Typical extent | VFR entry | Equipment |
|---|---|---|---|
| A | 18,000 ft MSL to FL600 | IFR only (91.135) | IFR equipment, transponder, ADS-B Out |
| B | Surface to ~10,000 ft MSL around major airports, "upside-down wedding cake" | An explicit ATC clearance ("cleared into the Class Bravo"). Private pilot or higher, or a student/sport/recreational pilot with the required 61.95 training and endorsements; some primary airports are closed to students (91.131) | Two-way radio, Mode C transponder and ADS-B Out within 30 nm of the primary airport (the "Mode C veil", 91.215, 91.225) |
| C | Surface to 4,000 ft above the airport (core 5 nm, shelf 10 nm) | Two-way radio communication established: ATC replies using your call sign (91.130) | Two-way radio; transponder with Mode C and ADS-B Out within and above the lateral limits up to 10,000 ft MSL |
| D | Surface to ~2,500 ft above the airport, usually ~4 nm radius, while the tower operates | Two-way radio communication established (91.129) | Two-way radio. No transponder required by the class itself, but check the Mode C veil and ADS-B rules for nearby airspace |
| E | Controlled airspace not A–D: surface areas, 700/1,200 ft AGL floors, 14,500 MSL up | No ATC contact needed for VFR | ADS-B Out at and above 10,000 ft MSL (excluding at/below 2,500 AGL) |
| G | Uncontrolled, typically from the surface to 700 or 1,200 ft AGL (higher in remote areas) | None | None by class |
Class B vs C/D wording matters. Hearing your call sign in a Class C or D reply ("N123AB, standby") establishes communication. In Class B you need the words "cleared into the Class Bravo airspace."
VFR weather minimums (91.155)
| Airspace | Visibility | Cloud clearance |
|---|---|---|
| B | 3 SM | Clear of clouds |
| C, D, and E below 10,000 MSL | 3 SM | 500 below, 1,000 above, 2,000 horizontal |
| E at/above 10,000 MSL | 5 SM | 1,000 below, 1,000 above, 1 SM horizontal |
| G ≤1,200 AGL, day | 1 SM | Clear of clouds |
| G ≤1,200 AGL, night | 3 SM | 500 / 1,000 / 2,000 (with a traffic-pattern exception, 1 SM within ½ mile of the runway) |
| G >1,200 AGL <10,000 MSL | Day 1 SM, night 3 SM | 500 / 1,000 / 2,000 |
| G >1,200 AGL and ≥10,000 MSL | 5 SM | 1,000 / 1,000 / 1 SM |
Plus: within a surface area of Class B, C, D or E you need a 1,000 ft ceiling and 3 SM ground visibility to take off, land or enter the pattern under basic VFR. Otherwise you need a special VFR clearance (91.157).
Reading the sectional
| Depiction | Meaning | Altitude reference |
|---|---|---|
Solid blue lines, e.g. "100/SFC" | Class B shelves | MSL, in hundreds of feet |
Solid magenta lines, e.g. "40/15" | Class C | MSL |
Dashed blue line, box "[29]" | Class D, ceiling 2,900 MSL | MSL; a minus sign (e.g. −29) means "up to but not including" |
| Dashed magenta line | Class E to the surface | Surface |
| Faded/shaded magenta vignette | Class E begins at 700 ft AGL | AGL |
| Faded/shaded blue vignette | Class E begins at 1,200 ft AGL | AGL |
See the FAA Aeronautical Chart User's Guide and AIM Chapter 3.
Exceptions worth knowing
- When a Class D tower closes, that airspace usually becomes Class E or G. Check the Chart Supplement.
- Satellite airports inside Class C/D still require contact with the controlling facility.
- Class B shelves above you aren't entered until you climb into them. Flying underneath the shelf requires no clearance, but speed limits apply (91.117: 200 KIAS under a Class B shelf).
Scenario practice
Next: practice airspace in 3D in the upcoming airspace explorer, and review METAR cloud heights (AGL).