Originally Posted by JPG3392

Until 30 March, you can use your miles for award travel on US and its *A partners, as well as AA and its partners (with some limitations). Rules and regulations for such travel are determined by US. As of 31 March, US will join OW. From then on, you will no longer be able to use US miles for travel on *A (UA, LH, LX, OS etc.), but you will be able to book award travel on all OW airlines. Until AA and US merge their FF programs, however, your US miles must be used through their program, which is more restrictive than AA's program in many respects.