Despite not growing their fleet much, Aer Lingus has very nicely expanded their longhaul route network the past few years.
Last year Aer Lingus added flights to Los Angeles, Hartford, and Newark. In 2015 they added frequencies to New York and San Francisco, and added a new route to Washington Dulles. In 2014 they started flying to Toronto and San Francisco. So they’re not growing at a Gulf carrier pace, but they are adding capacity consistently.
It looks like we now have a hint of Aer Lingus’ next longhaul route. While the schedule hasn’t yet been published, Aer Lingus’ CEO has stated that the airline will launch 2-3x weekly flights between Dublin and Las Vegas this coming winter.