I thought they did, but when I called AA reservations at the AAdvantage Gold number to see about switching one of my upcoming AA flights to a more convenient TWA flight, I was told they do not. I am flying with a first class upgrade paid for with mileage. I asked the agent if I could switch flights, since AA owns TWA. She said, "We don't own TWA, and I don't think I can switch you. Even if I can, you can't be upgraded." So she put me on hold, then came back and said she couldn't put me on TWA at all, even though there are plenty of open seats on the TWA flights. I thought their frequent flier programs were interchangable, but I guess they're not if I can't upgrade on TWA using AA mileage. According to news releases, AA is already putting More Room Throughout Coach into TWA planes and repainting them. Can they do that to planes that aren't theirs? Was that reservations agent correct? Or should I call back and try my luck with a different agent?