What Terminal is Aer Lingus at SFO operating out of San Francisco International Airport's (SFO) International Terminal is Aer Lingus. It makes use of Boarding Area G, which is set aside for use by foreign carriers. SFO's International Terminal is well-appointed with shops, dining establishments, and lounges to make sure passengers have a nice trip. Especially for international travel, passengers on Aer Lingus flights should schedule their arrival at the International Terminal well in advance to provide time for check-in, security screening, and any other pre-flight formalities.