—
Active ARTCCs
w/ active TMI
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Active TMIs
SWIM TFMS feed
22
ARTCC Centers
CONUS + HI/AK/PR
Stub
SWIM Feed
configure SWIM
Airspace Tools — Quick Access
Flow Constrained Areas (FCAs)ATLAS catalog — 10 major FCAs
ARTCC En-Route Centers0 centers · 0 airports
Controlled & Uncontrolled Airspace — FAA Order 7400.11
A
Class A — 18,000 ft MSL – FL600
IFR only
Controlled — entire CONUS above FL180. All aircraft must have IFR clearance.
B
Class B — SFC – 10,000 ft MSL
ATC clearance req'd
Upside-down wedding cake around primary hub airports. All ops require explicit clearance.
C
Class C — SFC – 4,000 ft AGL
Radio contact req'd
Around airports with approach control. Mandatory radio contact before entry.
D
Class D — SFC – 2,500 ft AGL
Radio contact req'd
Around airports with operating control tower.
E
Class E — Varies (1,200 ft – FL180)
IFR: controlled
Transition, en-route, and surface areas. Most ubiquitous airspace class.
G
Class G — SFC – 1,200 ft AGL
Uncontrolled
Below Class E floors where Class E not designated. Uncontrolled airspace.
Special Use Airspace (SUA)Check Live SUA Status ↗
Restricted (R-)
Entry prohibited/restricted without permission. Violators may be intercepted.
Warning (W-)
Hazardous activities — VFR flight cautioned. No separation provided.
MOA
Military Operations Area — IFR separation not guaranteed inside active MOAs.
Alert (A-)
High density military training — not prohibited but ATC separation not guaranteed.
Prohibited (P-)
Flight prohibited for security or national interest (e.g., P-56 Washington DC).
National Security Area
Voluntary avoidance requested — violators may be intercepted by military.
Airspace classifications per FAA Order 7400.11 · ARTCC TMI activity from FAA SWIM TFMS · Airport counts from NASR 28-day · Not an official FAA product · Verify via current NOTAMs and charts