Subic Bay International Airport serves as a secondary and diversion airport for Ninoy Aquino International Airport in Metro Manila and Clark International Airport in Pampanga. It also serves the immediate area of the Subic Bay Freeport Zone, the provinces of Bataan and Zambales, and the general area of Olongapo in the Philippines.

The Subic Special Economic and Freeport Zone, often shortened as Subic Bay or Subic, is a special economic zone and freeport area covering portions of the city of Olongapo and the town of Subic in Zambales, and the towns of Hermosa and Morong in Bataan in the Philippines. The relatively developed and fenced area is called the Subic Bay Freeport Zone (SBFZ).