First come first served.How does Southwest do there travel?
It doesn't matter when you list.
You are time stamped when you check in for your flight at a kiosk or ticket counter at the airport.
You are then placed on the standby list according to that time and your boarding priority.
A. Emergency travel
B. Employees and accompanying travelers
C. Eligible travelers not flying with an employee (dependants, retirees, companions and interns).
D. People on buddy passes
E. Other airline employees
Ect.
It is simple and seems fair to me.
It is also free.