 The terminal originally had a design capacity of 4.5 million passengers per year, but it was further expanded to accommodate 6 million passengers.Terminal 1 is currently used by numerous major international airlines, including Philippine Airlines, China Airlines, China Southern Airlines, Malaysia Airlines, Vietnam Airlines, Japan Airlines, Korean Air, Royal Brunei Airlines, and Saudia.Following the destruction of the original structure of Manila International Airport by a fire on January 22, 1972, a slightly smaller terminal, designed by Philippine National Artist for Architecture, Leandro Locsin, Sr. and his firm L.V.