Thanks!! I just did it MCO to DCA on June 15 changed it to MCO to BWI on May 24. (I had a the May 24th itinerary already and I wanted to change flight time but was charging me a lot, now I just made a fake test flight to see if the change would work, when I saw it did I cancelled my original itinerary and rebooked with the travel funds then changed back to the original day at the time a preferred, than I cancelled my test ticket)