Apt: GP

MINNESOTA	GPZ	GRAND RAPIDS-ITASCA CO GORDON NEWSTROM FLD
MISSISSIPPI	GPT	GULFPORT-BILOXI INTL
MISSOURI	GPH	MOSBY MIDWEST NATIONAL AIR CENTER
MONTANA	GPI	KALISPELL GLACIER PARK INTL
TEXAS	GPM	GRAND PRAIRIE MUNI