Originally Posted by Vegas Agent

No, all stations use the same system...but placing a passenger on the list with the correct priority is up to the agent.

The priority codes are as follows:

A - Full fare F26 - standby earlier/later flight (only used if P/F sold out)
B - YUP and Plat Elite
C - Seldom used - if memory serves me it involves Biz class international certs
D - Gold Elite
E - Mileage upgrade tickets - standby on earlier/later flts (I could be wrong)
F - Silver Elite
G - Plat and Gold Companion Upgrades (no differentation btwn the Plat/Gold)
H - Used for various standby upgrade certificates (often Alaska MVP certs)
J - Used for various standby upgrade certificates

Again, the agents placing someone on the list can enter any priority they wish. In most cases, elites not upgraded in advance by EUA are already on the list in the correct priority and just must be "verified" when they check-in which activates their name on the standby list.