In the UK, I have seen plenty of Aer Lingus A320 family jets. In the Midwest and on the west coast I have seen their A330s a lot too. One type of theirs that I have not seen before is the 757. These seem to be used for the shorter transatlantic runs. While taxiing out at Newark for a flight back to Seattle, a Shamrock 757 taxied out too and departed ahead of us. I have to admit I was quite surprised. I guess I knew they had 757s but this was the first one I had seen.