Even after merger talks between United and Continental fell through a few months ago, the two airlines are still interested in cooperating - yesterday, they announced plans to start codesharing and for Continental to join Star Alliance, of which United is a member. According to an email sent out to Mileage Plus members, United expects the deal to start sometime in 2009.
It remains to be seen what this means for US Airways, which has been a Star member for a few years now. It's possible that it could remain in Star, but having three US airlines in the same alliance could lead to some overlap.
photo by sea turtle 
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