The type or class designation of an airspace feature.
CLASS_B, CLASS_C, CLASS_D, and CLASS_E variants are controlled airspace.
Class E subtypes follow FAA NASR LOCAL_TYPE designations:
CLASS_E2: Surface area (SFC floor) around airports without an operating control tower
CLASS_E3: Airspace extending to SFC for instrument approach procedures
CLASS_E4: Transition area with a 1,200 ft AGL floor
CLASS_E5: Surface area with a 700 ft AGL floor (most common)
CLASS_E6: Transition area (miscellaneous)
CLASS_E7: Federal airway extensions
MOA, RESTRICTED, PROHIBITED, WARNING, ALERT, and NSA are Special Use
Airspace (SUA) types.
ARTCC features represent the lateral boundary of an Air Route Traffic
Control Center stratum (e.g. ZNY HIGH, ZBW LOW, ZAK FIR). One ARTCC is
typically published as multiple features - one per altitude tier or
boundary type - because the lateral extent can vary between strata. See
ArtccStratum for the stratum identifier carried on each feature.
The type or class designation of an airspace feature.
CLASS_B, CLASS_C, CLASS_D, and CLASS_E variants are controlled airspace. Class E subtypes follow FAA NASR LOCAL_TYPE designations:
MOA, RESTRICTED, PROHIBITED, WARNING, ALERT, and NSA are Special Use Airspace (SUA) types.
ARTCC features represent the lateral boundary of an Air Route Traffic Control Center stratum (e.g. ZNY HIGH, ZBW LOW, ZAK FIR). One ARTCC is typically published as multiple features - one per altitude tier or boundary type - because the lateral extent can vary between strata. See ArtccStratum for the stratum identifier carried on each feature.