What Terminal is Aer Lingus at SFO Terminal 1 of San Francisco International Airport (SFO) is where Aer Lingus is based. Known as the Harvey Milk Terminal, this freshly remodeled terminal provides a contemporary and effective travel experience for both domestic and international flights. Aer Lingus passengers departing from Terminal 1 can take advantage of a number of facilities, such as eateries, shops, free Wi-Fi, and cozy seating sections. Aer Lingus passengers may also easily access ground transportation, security checkpoints, and check-in counters from the terminal, guaranteeing a swift and easy departure.