Originally Posted by
bloc0102
I've only flown VS ticketed/DL metal award flights domestically, but they've all been DL marketed and I've received upgrades at the usual GM window.
Yes, if the DL flights are on VS award tickets, then flights will be DL coded and DL system can process upgrades as normal. If they are VS revenue tickets, flights will be VS coded and thus DL system will not be able to process upgrades.