The National office at MCO is open 24hrs. I would assume the same goes for Emerald Aisle service, but that's a big assumption on my part. You can probably call the MCO National office and ask someone there for definitive answer: 407-855-4170. The phone number comes from the National website: top nav bar, second line --> click "Locations" --> choose the appropriate drop-down: City or Airport Code --> enter Orlando or MCO in the search box. Hope that helps! Enjoy your trip!