AIRPORT_CLASS

10 codes

** CLASS OF AIRPORT
A MUNICIPAL AIRPORT
B MILITARY AIRPORT
C JOINT MILITARY/CIVIL AIRPORT
D FEDERAL AIRPORT
E PRIVATE AIRSTRIP
F LOCAL AIRPORT
G PREPARED LANDING AREA
Y OTHER
Z UNKNOWN/NOT REPORTED

Source

Codes verbatim from the ct_Pre1982 table of PRE1982.MDB — the FAA-distributed pre-1982 NTSB aviation accident database. Used internally by the Atlas to decode legacy accident records on every pre-1982 NTSB event page.