Originally Posted by
nexus7556
I want to confirm something about FFC. These can only be used on new flights, right? I cannot use it for change in fare on an existing flight, e.g. from Y to J? (without rebooking?)
Are you refering to a cash upgrade or a refare?
UA states
All travel credits can be used to buy tickets on United, United Express and partner-operated flights purchased on our website or app. You can also apply travel credits toward non-ticket items, like Economy PlusŪ seating, Basic Economy seat assignments and preferred seating.To use travel credits with PlusPoints, you’ll need to book your ticket using your travel credit and then request a PlusPoints upgrade.
I have never seen FFC payment option for upgrades.