Originally Posted by Phoenixtinct

That's odd - why a month-long gap? When CO left ST to join *A, there was a 2-day gap. Moreover, TAM is scheduled to switch to OW at the end of March, so I don't see why complicate matters and add another new carrier to the mix within a day or 2 of that happening. Also, what happens between March 1st and April 1st - US DM members will only receive FF benefits when flying US or AA? That's quite limiting. Especially, if you travel internationally, lounge access is rather important. I hope this is just something they are considering but not the final outcome.