Originally Posted by
spartacusmcfly
Has happened to me several times. Here's what I think is happening:
1. UA is using the legacy self-serve rebooking feature that calculated the fare-difference with a floor of $0 (never negative). Given the legacy policy was, no residual, this made sense.
I have run into this as well, when you change your flight to a lower fare UA only shows a $0 price difference on the flight selection page then shows the credit on the next page. I am trying to figure out if this will be short lived or if this is intentional, yes the additional out of pocket cost is $0.00 to change the flight.