we went,to san francisco,with united in oct last year,then flew back to florida,for 10 nights.on our way home,the route was via washington,to heathrow.
i like flying united,as i find their seats,quite roomy,which makes a difference to the journey.they do have seat back tv's & you can choose your seats online,at no charge.me & my grandaughter,had 3 seats,between the 2 of us!
can't really recall,that much about the airport,as we didn't have an awful lot of time,between connections,so can't help there,but united are my 1st choice of airline,whenever we go to america.
hope this helps
tracy