We have been able to secure space on Disney's Magical Express Transportation Service with as little as 24 hours notice. ME recommends you reserve your space at least three weeks prior to your arrival so your vouchers and luggage tags have ample time to reach your home.
If you do make a last-minute ME reservation and won't be able to receive the luggage tags, have no fear- they have you covered! Simply proceed to the ME Welcome Center (between the hours of 0500-2200) and present the Cast Members with your luggage tag receipts from your airline along with a detailed description of the bags. ME will retrieve your luggage from baggage claim and deliver it to your resort room! Keep in mind this may delay your luggage a little, so always pack a carry on with any necessary medications or other items you may need for the day.