While it’s not quite as straightforward as in the past, US Airways is offering a Silver status trial for 90 days. This time, though, you have to purchase a non-refundable domestic ticket on US Airways via usairways.com before they give you the status. You can register for the promotion here. You must register and purchase a ticket by August 15 and you must travel by September 15.
Keep in mind that Star Alliance Silver status will waive bag fees on US Airways and all other Star Alliance carriers, so this is worth something, assuming you would otherwise travel on US Airways at least once to meet the non-refundable ticket requirement.
It’s worth noting that those that have participated in a similar trial in the past 24 months are not eligible.