Originally Posted by
MathMusic
Hmm I don't think that is true, because back in the days of 500 mile upgrades I had both a miles and copay upgrade and a sticker upgrade clear for the same flight. The C upgrade cleared a day or two before the R upgrade cleared day of (I was a lowly gold at the time).
There are several threads here with people saying this is true. I've never used miles to upgrade, so I have no first hand experience with this. Others on here definitely do, though.
I am confused by your post about two upgrades both clearing. I don't see how that would even happen.