Food service is decent. Better than many other airlines over the pond, including BA and even TK. AA is a good choice transatlantic at the moment. Note that depending on when you are leaving, all of the flights to hubs other than DFW on AA out of LHR have been suspended for the upcoming months due to the lockdown, so you may have to connect. There is no domestic service in Y, there is (though not pre-COVID) service in F.