OK, here 's the deal on EWR. It is very convenient, with the only difficulty is the line for security is pretty long in the early morning – say 6 o’clock thorugh 8:30 or so… After that, you sail right through. It has very good parking and a lot of flights to MCO.
Getting to and around LI can be, well, a word I don’t like to use here. I have never used Islip, but I do know that Southwest is now operating out of LaGuardia, though I believe there are no direct flights to MCO from there.
*** Also check out White Plains/Westchester, which would be such an easy drive for you! Here is the site – maybe it has something that would work for you. I have heard nothing but good things about how easy it is to use this airport!
Westchester County Airport, Airlines, Arrivals, Departures, Delays