You can no longer search flights at USAirways.com. Instead, when you enter search information you get redirected to the AA.com 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.