Not a problem. Wear an extended wear diaper and plastic pants on the plane. You can add a booster pad if you like, but I'm sure for the amount of time in the airport and/or on the plane an extended wear diaper and plastic pants will work without any problem.......be there and done that many of times before.
I would recommend you take a back pack with a change of clothes including a few diapers just in case you need to change. You probably will not need it, but its best to have an extra change with you....better safe than sorry. Security at the airport MAY look inside the back pack but will NOT remove the contents for public viewing.
While your at Disney World, you want to have your back pack accessble in case you need to change. Again, I would recommend the use of an extended wear diaper and plastic pants. I have found that a long pull over shirt that hangs down some works the best. You don't need a shirt that hangs down to you knees,...... but something that looks nice and hangs down a little that will not show bulk if your wearing a booster pad in the diaper. I wear this type of shirt most the time and find it to be very comfortable plus its a good way to conceal any bulk you might have for reasons mentioned. Additionally, this type of shirt also conceals the diaper from the back so you don't have to worry about having an untucked shirt with a diaper showing while wearing shorts. I live in AZ so I know these things.....trust me!
Have fun!
