US Airways Dividend Miles has been folded into American AAdvantage. Apparently a very large number of customers who had accounts in both programs linked them, and that ensured miles got folded into the right accounts.
While Dividend Miles numbers will still work (including to log in at aa.com), they’re trying to transition people to using their AAdvantage numbers. [US Airways members who did not already have AAdvantage accounts were given new ones.]
While reports I’ve heard suggest that the process of combining accounts went really smoothly (there will always be outliers in a data migration project including about 100 million individuals, more unique accounts than that between the two programs, and all the individual transactions within each account), there are going to have been some people who did not link their accounts and where American couldn’t identify them as belonging to the same person.
So for folks whose American and US Airways accounts weren’t combined, there’s a self-service option. You can combine your own accounts.
Log in at aa.com and it’s right there at the profile summary.
You’ll have to have information match between the accounts, and the process isn’t instantaneous, but you can still go online and get your accounts combined.