EAN (Enterprise/Alamo/National) share a fleet at MCO. I went this past summer with my family and had reserved a 'Premium Car' (Chrysler 300 or similar). They didn't have anything after I had been waiting 30 minutes for them to bring a car down for us, and they advised me they were upgrading us to a 'Premium SUV', which ended up being a 2015 GMC Terrain 2-SLT V6, Front-Wheel-Drive (FWD). You don't get to pick what you get at MCO when booking with Enterprise.