Thanks for contacting us!
I did some investigating, and found that we have an open ticket in
reference to this specific issue. This open issue specifically calls out
that all award tickets that were booked on US Airways before October
17th that take off after October 17th will throw an error on the site.
You will be unable to view your reservations until October 17th, which
is the day US Airways and American merge as one airline. Given your
flights are booked for December, you'll have plenty of time from October
17th through takeoff to manage your trip.
I'm very sorry for the inconvinience, as I understand this can be frustrating.