They seem to have a lot of this going on lately out of ATL. Some last of the day flights have a really high cancellation rate. At my last cancellation, I basically was stuck with no help given. Asked them to put me on a DL flight, you're kidding, seriously, was the response. They may be able to put you on a WN flight yes, but last time I was "stuck" I had to wait for a day to get the next available flight. I wouldn't do it on the last flight of the day since you have an important connection to make to Hawaii or you could miss the whole honeymoon. Learned not to schedule the last flight of the day on AirTran. And now with 717's moving over to DL, this might make the remaining 717's and 737-700's scheduled a little tighter.(Your flight is on a 737-700 )