Originally Posted by
Sea Plane Driver
Facilities in DUB and SNN?
Haven’t flown those destinations since mid 1990s, US Custom and Immigration there? (I vaguely remember the Pre-Check in Shannon)
Not a problem in that case, but Westchester Airport is still a mess, highly not recommended..

Full US CBP in DUB and SNN. You walk off the plane in the US as a domestic passenger, no checks. A minimal facility is required at the receiving end.
What's possible and what's economically viable are very different things of course.
They've already broken cover and applied for DUB slots so that's where my money is.