Aer Lingus Airlines flies from Terminal 2,Dulles International Airport, offering passengers a smooth and efficient airport experience. The Aer Lingus Airlines IAD Terminal includes quick check-in services, fast security for select travelers, and easy gate access. Passengers can relax with various food, shopping, and lounge options. Since U.S. customs are pre-cleared in Dublin, arriving passengers at the Aer Lingus Airlines can exit the airport swiftly without the need for additional immigration checks.