A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,012
Preclearance in DUB isn't too stressful, and gate lice is mainly a thing that we Flyertalkers like to overreact about.
Your flight will likely be quite enjoyable. The U.S. carriers generally have pretty good J products, and this one is no exception. (It's the three-cabin F soft product where they lag.)
Enjoy your trip!