Originally Posted by
eponymous_coward
http://virginamerica.custhelp.com/cg...5nZSBGbGlnaHQ*
Changes made after day of departure upgrade:
If you’ve purchased a day of departure upgrade, and you cancel or change your reservation, any charges from those actions will relate to the fare rules from your original class of service.
This is different from a NON-day of departure upgrade, though, which is what I tried in the past (and has worked). But that was a long time ago.