I originally booked a flight fron ONT to SEA via American Express Travel. It came up as American Airlines, but was actually an Alaska Air flight.

A few weeks ago I noticed they cancelled my original flight from SEA to ONT @ 1:40 pm and booked me on a flight at 7:32 am. This was too early for me and I would not be able to make the flight. I was able to rebook at no cost for the next day @ 7:32 am. I have my seat assignment on this flight as 7A & 7B. But on AA's web site it shows me being in 23A & 23B. Why won't it update on AA's website? I had Alaska Airlines change my seats on both flight, and the second flight still shows 23A & 23B.

Any ideas why?