Originally Posted by jhayes_1780
But that is how it converts in reverse.... when they expire (if unused) a 500 mile cert turns into 500 RDM's
And you can do this anytime by calling Mileage Plus (no need to wait for the 500 mile certs to expire). I never fly UA for domestic travel, so I have done this in the past to top-up my account for an award. Once done, however, you cannot reverse it.
