I have only flown on United out of the American airlines.
I literally can not explain how excellent the service, aircraft and punctuality was. I had 6 flights in one week:
UA 777 LHR – Washington
UA 777 Washington – Denver
UA A319 Denver – Jackson Hole
and one the return:
UA A319 Jackson Hole – Denver
UA A319 Denver – Chicago
UA 777 Chicago – LHR
Every aircraft was in excellent condition, specially their A319’s! Unbelievable. Also, the 777 was great, with excellent in flight entertainment. The only bad thing about the flights was the food. The food was terrible! It came in a brown bag, infact I kept them, and the food that we recieved was bad. But then they are struggling so what can you expect?