Having trouble finding good fares and good times for airfare from Philly to Mco. I found I like going down times for southwest and coming home fare for usa300. My trip is 10-22 to 10-30. How far out should I hold out for a possible DING special? I guess my question is, are there any problems I am not thinking about if I use two different airlines? I don't see why there should be, but I am not an expert at any of this and all this information is going to make my head explode!