I had a flight booked BUF to MCO on April 22 because there was no availablity of cheap seats on the 21st, however about a two weeks ago some seat became available and I was able to switch to the Sat flight. I am now checking everyday because I want the earlier non-stop on the the 21st. I think they must free up more cheap seats depending on how full the plane is. But I guess that is good for me and you!