Originally Posted by
Flyiboy
What determines the amount of UG ? Booking class or milage ? Can I find this info somewhere ?
http://www.delta.com/traveling_check...nges/index.jsp
Scroll down to Same-day Standby Upgrades
The fee varies by the length of the flight. All fare classes are charged the same for the upgrade, but you must be traveling on a Y, B, M, H, Q, or K fare to be eligible.