I am sorry if this is a really stupidly easy question, but I don't want to cock up and I cannot find the answer myself...
My DS (11) and I are travelling to the US in a fortnight to visit friends.
We have (obviously) valid passports and our ESTAs have been approved. Is there any other paperwork / online thing that we will need to fill in or have before we travel.
I am rather paranoid because my American friend (US passport) with her two kids (US passports) and her British husband (UK passport and had travelled to US before) actually missed their flight last year because they arrived at the airport and were told they hadn't done some crucial thing, and had to spend aged trying to do it online at the airport, but they are not very good at explaining and I do not know what it is they had to do!
Any help / advice from you lovely people would be gratefully received - thank you!
(btw we are flying direct, LHR to LAX - in case that is sigificant...)