Originally Posted by
safigan
DL trumpeted the "new improved" PMUs that could be used on the day of travel. Has anyone actually had success upgrading on the day of travel after it appeared that they wouldn't be upgraded otherwise?
Originally Posted by
vasantn
You can confirm your upgrade well outside the complimentary upgrade window if the right inventory is available.
Can someone please rectify these contradictory statements? Can you use the upgrade certificate in advance or not? And if not, and you wanted to use it domestically, you'd just show up at the airport and ask if there is "upgrade inventory" available using a certificate as opposed to the "upgrade inventory" using the free medallion upgrade?? Are these sets of availability taken from two different fare classes?