Originally Posted by
BEAV
If I book Y now, and decide at a later date to upgrade to F (before date of travel and check-in), will VX charge me their $40 change fee in addition to the difference of fare?
Playing with the website a bit, it appears that if you make a change from Y to F, the change fee is shown as $0 in the change summary, which suggests no; however, when last I tried, you can't make this change on the website; a message says you have to go to the airport. I assume that calling Res would also work, but I don't know if they would also consider this to be a fee-free change. Why not call and ask?