Clark International Airport / Clark Air Base

Clark International Airport / Clark Air Base carries the IATA code CRK — the three letters printed on boarding passes and baggage tags — and the ICAO code RPLC, used in flight plans and by air traffic control. It serves Mabalacat, Philippines.

IATA codes are assigned by the International Air Transport Association for passenger-facing use; the four-letter ICAO code encodes region and country and belongs to the operational side of aviation.