Yes this can be done. When I booked our 7 tickets with SWA, at $79 + 1 way, I booked each leg of the trip separately just in case the rates came down, because I knew I would have to cancel the original reservation and use the credits. Remember when you cancel - you cancel all reservations to and from MCO. Anyway, the SWA ticket went down to $49+ 1 way, I was able to get that rate for the return flights, but not for the flight down (our departure date was not available). That put $210 in my credit account with SWA.....that will pay for a quick trip in the fall or spring. I did the same thing with SWA last December and used the credit account to pay for airfare for my Birthday trip to see the Mouse in May. I LOVE SWA.