This is great news as it means you will still be able to book certain Star Alliance airlines after the merger with AA takes place.  It’s also good news for people who have already made a booking for travel that will take place after the merger as US will still have access to award seats and a relationship with these airlines in case of irrops.  Here is the full email.  I bolded the most important facts you will want to remember.

An update on our alliances and codeshares

We’re excited to be a part of the new American and look forward to bringing you a stronger airline. In early 2014, we’ll be entering into a codeshare agreement with American, which means that you’ll be able to seamlessly book travel throughout the US Airways and American network.

On March 31, 2014, we plan to join the oneworld® alliance, so you can look forward to mileage earning and redemption opportunities, reciprocal elite benefits and lounge access on oneworld carriers. Some of these benefits will be phased in as we work toward full integration.

There are a few important changes to keep in mind for future travel:

We’ll be exiting Star Alliance on March 30, 2014. You’ll be able to earn and redeem Dividend Miles on Star Alliance carriers until that date. Any existing reservations for travel on a codeshare flight with a Star Alliance partner after March 30, 2014 are safe, however, you’ll be rebooked with a new flight number from the carrier operating the flight and you’ll no longer earn Dividend Miles or receive Star Alliance Gold or Silver benefits.

Since the legal close of our merger with American on December 9, 2013, we no longer offer codeshare flights for sale with United Airlines. When we exit Star Alliance on March 30, 2014, we will no longer offer codeshare flights for sale with Brussels Airlines, Lufthansa or SWISS. Any existing reservations are safe, but you will not earn Dividend Miles for flights on these carriers after March 30, 2014.

We plan to continue relationships with the following airlines, so you can continue to earn and redeem Dividend Miles on these select partners even after we’ve exited Star Alliance: Aegean, Air China, Air New Zealand, Avianca, Ethiopian Airlines, Eva, Shenzhen Airlines, Singapore Airlines, South African Airways, TAM, TAP and Turkish Airways.

US Airways customers with Star Alliance Gold status will no longer have access to Star Alliance lounges after March 30, 2014.

You can learn more and stay up-to-date by visiting usairways.com/arriving.