Yeah I think the first leg heads to Ireland too.
British Airways does fly from LA to London and then to Shannon. (To get from LA to Belfast, one would fly to London then onto Manchester and finally into Belfast.)
The pictures remind me a lot of the Burren or even the Aran Islands, so I think they go to the Republic of Ireland rather than Northern Island.
If the teams do land in Shannon, teams can drive from the airport easily into the Burren or drive from Shannon through Ennis and onto Doolin and take a ferry over to the Aran Islands.
I am so glad they are finally going to Ireland! I have wondered why the never did before. Of course driving in Ireland is always an adventure!