The Aer Airlines Lingus ORD Terminal Many international airlines and flights are served at Terminal 5 sometimes referred to as the International Terminal. Flying to and from Dublin Aer Lingus offers easy connections to a number of locations throughout Europe. With its contemporary features—such as restaurants retail stores and lounges—Terminal 5 guarantees a pleasurable traveler experience. In this elegant terminal Aer Lingus travelers can check in at designated counters go through security checks and unwind before boarding their flights.