We are looking at having my brother's kids aged 14 and 15 come and stay with us in the USA from the UK this summer, we're tracking Covid related concerns of course but that aside I was looking for recent experience with UM travel internationally. From what I have read they are okay in terms of age, they need forms as approval from parents but from what I have read there seems to be little if any "hand holding" (or, for that matter fees). This seems quite different to our experiences with domestic UM travel in the US.

While they are mature and sensible I think navigating immigration and customs can be daunting at the best of times, if anyone has any experience to relate I would appreciate it. It's likely this would be direct LHR to BOS on BA or AA although we had also considered BHX-DUB-BOS (but a layover is worrisome). I may cross-post to the AA forum to try to capture insights from folks familiar with AA.

Thanks for any help, Chris.