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Special Use

This diagram helps understand how to find airspace classes on a sectional chart; and summarizes some of their requirements and limitations.

Controlled and Uncontrolled

Controlled (AIM 3-2)/ Uncontrolled (AIM 3-3) Airspace

Name	Authority	Notes
Class A	AIM 3-2-2 14 CFR ¶71.31 14 CFR ¶91.135	180 to 600 hft MSL ∩ above 15 hft AGL IFR only
Class B	AIM 3-2-3 14 CFR ¶71.41 14 CFR ¶91.131	surface to 100hft MSL (generally) private pilot certificate (if not otherwise disallowed: student pilot with endorsement) ‘Mode C veil’ within 30nm of airport
Class C	AIM 3-2-4 14 CFR ¶71.51 14 CFR ¶91.130	surface to 40 hft AGL (generally)
Class D	AIM 3-2-5 14 CFR ¶71.61 14 CFR ¶91.129	surface to 25 hft AGL (generally)
Class E	AIM 3-2-6 14 CFR ¶71.71 14 CFR ¶91.127	145 to 180 hft MSL ∩ above 15 hft AGL above 600 hft MSL
Class G	AIM 3-3 14 CFR ¶91.126	everywhere else uncontrolled

Special Use

Special Use Airspace (AIM 3-4)

Name	Authority	Notes
Prohibited	AIM 3-4-2 14 CFR ¶73.81 14 CFR ¶91.133	flight prohibited
Restricted	AIM 3-4-3 14 CFR ¶73.11 14 CFR ¶91.133	flight prohibited when active (‘hot’); permitted when inactive check sectional (and NOTAM) and/or controlling agency for time and altitude of activity
Warning	AIM 3-4-4	like Restricted, but over water
Military Operations (MOA)	AIM 3-4-5	don't need clearance, but “exercise extreme caution” check sectional (and NOTAM) and/or controlling agency for time and altitude of activity activity may be unusual (prohibitions against aerobatic flight possibly waived) separation service for IFR flight
Alert	AIM 3-4-6	don't need clearance, but “be particularly alert” check sectional (and NOTAM) and/or controlling agency for time and altitude of activity activity follows CFRs (no waiver); but possibly higher volume no separatation service for IFR flight
Controlled Firing	AIM 3-4-7	not charted activity stopped automatically

Other

Other Airspace Areas (AIM 3-5)

Name	Authority	Notes
Military Training Route (MTR)	AIM 3-5-2	four digits: no segment above 1500 AGL
Temporary Flight Restriction (TFR)	AIM 3-5-3
VFR Routes:
VFR Flyway	AIM 3-5-5a	outside of, or inside lateral boundary of but above/below, Class B clearance not required remain in communication of some ATC?
VFR Corridor	AIM 3-5-5b	‘hole’ through Class B airspace clearance not required uncommon
VFR Transition Route	AIM 3-5-5c	within Class B airspace clearance required within Class B available in some Class B
Terminal Radar Service Area (TRSA)	AIM 3-5-6	not regulatory: not part of 14 CFR 71 or 91
Special Flight Rules Area (SFRA)	AIM 3-5-7