I am probably the only one who's ever had a bad experience connecting in Y. Even then I'd have probably made the flight with that length of connection, if connecting to domestic. It is quite a big airport but not that bad to get around.

Not done the 'big' USAir domestic planes but the A330 economy product is excellent because of its layout, and arguably better than BA. Food isn't bad. Seats are comfortable. AVOD is fine, a little outdated but so's BA's 772.

2-4-2 seating although status doesn't give you access to the better seats yet - it should once it's all fully integrated into AA however.

The long domestic would be more of a concern but others are better placed to answer that than I am.