Hello there, I am fyling AA from Bos-JFK, then i have a First class for BA to LHR from there.
I have no idea how the terminals work. Since they are different tickets booked seperately will i have to leave the terminal and come back in(I dont have any bags checked)
Are there customs at jfk to goto my flight to london or will i just have that once i arrive in london?
I'd want to goto the concorde lounge so hopefully i can just flyi n from boston and go straight there?

I go a week or two after the games are finished. Will the crowd in london settle down since then?

thanks for the help!