This is my 12-year old's second trip to Disney and his first plane ride since he was a toddler. More so than his autism, I think his proprioception issues and global apraxia will make a crowded airplane aisle difficult for him to navigate. It would help a lot if he could preboard when there are fewer obstacles (ie, people and luggage in the aisles). I've checked the cognitive/developmental disabilities button on his reservation, but his motor issues probably won't be obvious while he's walking around the airport. I know that I need to talk to someone at the airport about preboarding--would that be the person at the curbside check in or someone at the gate? On the return trip, do we ask at the resort's MCO check in desk or the airport? I'm sure we'll be asked a few questions about why we need to preboard. Should I bring something from a doctor, or are they not allowed to look at documentation? Are most people who request preboarding given permission, or is there a good chance we'll be denied? We purchased Early Bird Check In for the other 3 members of the family but not for the 2 of us who are trying to preboard. If worse comes to worse and they deny us, we'll try boarding last and then switch seats with 2 of our Early Bird boarders, so that DH and my oldest end up in whatever seats are left at the end while I sit with the 12-year old and 9-year old. Thanks for any help!