Update: Per American the redirect from the US Airways website over to AA.com is temporary while IT performs maintenance on the US Airways website.
Now, American and US Airways flights become one on October 17. From that date onward there will only be American Airlines flights.
For travel through October 16, though, customers have been advised that they are better off booking US Airways flights directly. That’s especially true for elites — if you book an American codeshare for a US Airways flight, you cannot upgrade until check-in. Elites clearly should be booking US Airways flights through US Airways and American flights through American until there’s no more US Airways at all.
But the US Airways website isn’t letting you book travel at all.
You get sent to AA.com and what displays for US Airways flights are American Airlines codeshares — exactly what you do not want.
Now, while getting sent to the AA.com website from US Airways only displays US Airways codeshare flights, you can get US Airways’ actual flight numbers to come up at AA.com.
You need to start a new flight search, and specify that you want to see ‘all carriers’ in your results (strangely, specifying to include oneworld airlines won’t work even though US Airways is part of oneworld).
Then you need to skip over American Airlines codeshare results, which will come up first, in order to get to true US Airways flights.
This is going to confuse many people who will clearly probably wind up booking American Airlines codeshares for travel on US Airways and wind up without advance upgrades (and lower upgrade chances as a result).
Another booking: if you want to book US Airways flights for travel through October 16, book through an online travel agency like Orbitz instead of booking direct so that you can book the US Airways flight number without any machinations. Make sure your frequent flyer number passes through and an upgrade is requested (which should be automatic).