ET schedule includes a 1 h layover in DUB according to a post on:
Irish 10/14: The Final Quarter — Civil Aviation Forum | Airliners.net
ET504 ADD 2300 – 0530+1 DUB 0630+1 – 0930+1 LAX 788 357
ET505 LAX 2330 – 1830+1 DUB 1930+1 – 0600+2 ADD 788 146
So no US clearance for now and check in area will be cleared as it couldn't take any more if it was departing much lather.