Daisy - what are you going to do with your dress once you get it on the plane? If you put it in the overhead it could get smashed. There is very little closet room on a plane, usually reserved for first class (and only big enough for suit jackets). My suggestion would be to mail the dress to Orlando and have a bridal shop or cleaners press it off there. I was in a wedding where one of the bridesmaids lived in Mississippi, she had the dress fitted there and then mailed to the wedding city, where a bridal shop took care of it.
Atotty - we noticed the helicopters overhead in October. Someone said it is a tourist helicopter based in Kissimmee, but that sounds risky, I don't believe it.