Originally Posted by UVAhoo06

In my very limited experience, the answer is no. I was on a very, very delayed flight from LAX-JFK in Mint. I upgraded using certificates. When I called B6, I asked to be put on another B6 flight leaving sooner than my delayed flight, she said that I'd have to reapply certificates and that there was no guarantee that (1) there'd be space and (2) that the number of required certificates would be the same. I basically said thank you and stayed on my very delayed flight.