Enough time has passed for the new card to have arrived. I would call them to see what's up.

And I would wait more than just a few months before closing. I keep cards open at least 10 months (to indicate that I am actually using and trying the card out, and not just churning it).

And in the case of this US Airways card you might want to wait until the 11-12 month mark (i.e., up until about the time when the annual fee for the following year comes up) because typically a 10,000-mile renewal bonus (even if you end up not renewing) will post into your account.