Right now the airlines are being quite good about their change policies, in my experience, as I had to make a quick family related trip requiring a change of flight on American. Also, did a flight change easily on Southwest for April trip, for a few less points. Orlando weather may not be that bad, I'd at least think the humidity would not be an issue in November. Well, compared to say, August! Weather wouldn't be an issue at that time of the year to me, but just keep in mind no fastpasses right now and less open park hours, reservations required and some days may not find HS available, if that is a consideration. I started reading more on the parks info thinking of doing a trip in winter. Having not paid too much attention to WDW happenings, reading more and listening to the last couple podcasts, wow, quite a bit of info I was not tracking!