There was some discussion that for the early morning flights the community wasn't 100% that facilities are available prior to 4 a.m. or 4:30 a.m. in some locations even if the first flight was at 5:30 a.m. to 6 a.m.
https://www.southwest.com/html/air/airport-information.html
If you click on "Detroit" you get this pop-up that suggests the terminal opens 2 hours before first flight and we don't know for sure if curbside shows up at the same time or not...4 a.m. I don't konw, 4:30 a.m. probably?
Home airport MDW, frequent visitor to MCO to see the mouse.
