Ok, so I purchased what I thought was a round trip ticket from BOS to SNN (Boston to Shannon) airport for a family of four. The Itinerary seemed strange, but the price was very good courtesy of Google Flights.
BOS to SNN; 10 days in Ireland!
SNN to LHR to DUB to BOS for the trip home.
When I visit the Aer Lingus web site it describes my tickets as such.
BOS to SNN (217 hr stopover) SNN to LHR. (Arriving in LHR at 9:50 AM)
LHR (Departing at 11:50am) to DUB (4 hour stopover) DUB to BOS (Home)
It appears I bought a ticket to London with a long stopover in Ireland.
I am only in London for two hours. What is alarming is that it is not clear that my bags would be checked through LHR to BOS since that is the terminus.
Do I need to retrieve my bags and check in at LHR for the return trip to BOS in the two hour window I have at LHR?!?
Never mind the complexity of US customs since I know Shannon is a pre-clearance airport but LHR is not.