All American airlines (AA, United, Delta, USAirways, Continental) are :censored:e. They are all broke and haven't been able to update their cabins for years (despite goverment subsidies, bailouts etc). Though United have just started upgrading theirs.
They are tight (mean) with food, drink, checked baggage (and now carry-on baggage). Continental started the trend of flying 757s across the Atlantic, so the rest will follow. BA are expensive but still good despite the Willie Walsh cuts in service.
Avoid US airlines at all costs if you can.