Air Canada has RON before at MCO
at their gate, gate 22. I don't believe that they are currently because this is their slow season, but they often do for their YYZ
flight in winter and early summer.
I also believe that WJA has RON before at MCO
in the past, mainly in the winter when they have all those extra flights to various Canadian cities. This was also at their gate, Gate 25. I remember nights where all of the gates were full in the 20s (International Gates Airside 1) during the winter and getting nervous I wouldn't have any gates in case there was fog in MIA
and we got several diversions. We had these RONs - Taca Gate 20, Air Canada Gate 22, West Jet Gate 25, Copa Gate 26, Jet Blue (domestic) Gate 27, American (domestic) Gate 28, Jet Blue (domestic) gate 24 and another Jet Blue at Gate 23. We had to make sure after that, that at least one gate stays open in case of an emergency international diversion - such as fog in MIA
that sent us multiple international diversions last January.
I never seen SWG or CJA
RON at MCO
because most of their flights usually arrive in the morning around 9am. TSC has never RON at MCO
as far as I know unless they had a mechanical, which then a couple times the A310 did RON.