Which terminal at MNL is used by United Airlines? United Airlines operates out of Terminal 3 at Ninoy Aquino International Airport (NAIA) in Manila. Terminal 3 is the airport’s newest and most modern terminal, offering a wide array of services including check-in counters, baggage claim, dining options, and lounges. If you’re flying internationally or connecting through Manila, knowing what terminal is United Airlines at MNL can save you time and ensure a hassle-free experience. visit:https://airlineofficedetails.com/united-airlines-ninoy-aquino-airport-terminal-mnl/