Apt: AT

ALASKA	Attu	CASCO COVE CGS
ALASKA	ATK	ATQASUK EDWARD BURNELL SR MEM
GEORGIA	ATL	HARTSFIELD-JACKSON ATLANTA INTL
NEW MEXICO	ATS	ARTESIA MUNI
SOUTH DAKOTA	ATY	WATERTOWN RGNL
TEXAS	ATA	ATLANTA HALL-MILLER MUNI
WISCONSIN	ATW	APPLETON OUTAGAMIE CO RGNL