We've flown out the NYC to MCO 5 or 6 times now at that time of year. We just flew out of Stewart on the Friday after on Jet Blue for $175 RT with great flight times, 8:35AM out and 11:30AM back. We have also flown out on Thanksgiving Day, much to my sister's chagrin, and paid about the same as flying out on that Friday as long as you pick a flight out after 1 or 2 PM. The Thanksgiving morning flights are still high as you can still make a Turkey Day dinner @ 3 or 4 PM in Orlando. If your family won't flame you for missing T-Day dinner and you can swing the extra holiday points, feel free to leave on Thanksgiving afternoon for about the same price. I don't have any experience from Macarther though - just EWR, LGA, JFK and now SWF.