Our cousin was born in Belfast, Northern Ireland, and has ILR in the UK. She is a dual citizen of the US and the Irish Republic.

Next week, she’s ticketed to fly San Francisco > Dallas > London Heathrow > Dublin on a single ticket purchased from British Airways. The first leg is carried by American, the second by British Airways, and the third by Aer Lingus. She will have checked luggage.

Will her luggage be checked through from SFO to DUB? Or will she have to retrieve it at LHR in order to pass UK Customs as the first stop into the Common Travel Area?