I've read several times, people trying to take Magical Express after arriving to the airport by car, not by flying and going to the resort. We are in that situation in March, returning a rented car to the airport, having been staying elsewhere before our Disney resort. I called DVC member services about it, thinking I'd have to create a flight # and you do not. They just put you in a "open ended" status for that day. You can still use your magic band as you approach Magical Express and it will be valid, just call ahead to ME or in my case, DVC, give them your info that you're arriving at the airport, without a flight # and you'll be all set.