Originally Posted by
JPG3392
I have had USAir flights credited to Mileage Plus several times. My MP number begins with 3 zeros, and these digits have always appeared on the reservation. I would call again, or at least speak about it with the agent at the airport when you check in.
My number always has the two leading 0s.
Much better to call in advance if you can't do it online.
If you forget to make the change at the airport, it is a hassle to request credit after the fact.