from web site
The primary site of Aer Lingus operations is the Aer Lingus Airlines DUB Terminal (DUB). The terminal is modern, featuring check-in services, U.S. preclearance facilities, and streamlined security processes. Aer Lingus flights, especially those on transatlantic destinations, depart from T2, providing easy access to several locations. With so many stores, eateries, and lounges (including the Aer Lingus lounge), passengers may have a pleasant day at the terminal.