u/Money-Problem-9600

A flight from Donegal CFN leaves at 14:30, lands in Dublin at 15:30. Operated by emerald airlines/Aer Lingus.
Flight to USA is at 16:45. And there is US Pre-clearance whatever that is.
Odds I make this flight to USA? It is the only way I can tour ulster on our upcoming roadtrip to Ireland. It is probably also worth mentioning this would be a Saturday and I will have a checked bag.
The Donegal Airport has two of these quick flights a day and they land in the same terminal (2) at DUB I would be flying out of to go to USA. I just have never connected in DUB before, much less with checked luggage. Thanks in advance