In reply to yorkshire_lad2:
I was in the States 2 weeks ago so know your pain!
Verifly didn’t work for us so took print outs and downloads etc. BA staff happy with that.
We didn’t do covid tests dues to recent positive test. Again BA happy with doctors letters.
What we saw regarding airport testing was that it was quick due to almost no one using the service there(T5)
No testing required for return flight on AA nor UK entry
We found that Vaccine passports are required to be shown for entry to certain places eg museums so worth having on your phone. Tip- don’t get them too early as only valid for a month.
Also there seems to be an outbreak of Norovirus in NY/East Coast so avoid licking toilet door handles( unless of course you want to not eat for a few days).