Operating Procedures For Airport Traffic Control Towers (atct) That Are Not Operated By Or Under Contract With The United States (non-federal) -- Advisory Circular (ac) 90-xx
OPERATING PROCEDURES FOR AIRPORT TRAFFIC CONTROL TOWERS (ATCT) THAT ARE NOT OPERATED BY OR UNDER CONTRACT WITH THE UNITED STATES (NON-FEDERAL) -- ADVISORY CIRCULAR (AC) 90-XX
OMB: 2120-0572
IC ID: 141591
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