Originally Posted by LawPanther

AFIK, this is the hiercarchy...

Once your reservation is ticketed, your upgrade will be cleared based on:

1.Your confirmation window
2. Availability
3. Fare class
4.Time of request

Confirmation Windows
Medallion Level Clearance Priority
All Medallions Time of ticketing for Y class fares
Platinum Medallion 5 calendar days in advance for B, M, H, Q, K, L, U, and T class fares2
Gold Medallion 3 calendar days in advance for B, M, H, Q, K, L, U, and T class fares2
Silver Medallion 1 calendar day in advance for B, M, H, Q, K, L, U, and T class fares2
2Clearance starts with B class and continues in descending order. If Medallion level and fare class are equal, time of ticketing will be the tie breaker.

WITH RESERVE CARD TRUMPING REG STATUS & FARE CLASS