Originally Posted by
itsG
Thanks. Was showing a $253 cash price for upgrade. Any insight on what this is based on? Is it just fare difference?
It's normally a function of the route (lookup table largely based on mileage) and current premium inventory. So for example, expect the route to always be $253 to buy up if Z is lowest available.
The route fare differential (for fares) works somewhat similarly, except that it is a difference based on the marketed Economy fare.