That's just it - to go from the east side to the west side, there's no "hope". It's just "you can't". 1 and 3 are on the west side with its own checkpoint. To get to 2 and 4 from 1 and 3, you have to ride the train to the central hub, exit the secure area, cross the terminal (past the food court, shopping areas, and the Hyatt), and then go through security and take the tram to 2 or 4. Depending on the security set-up, you *may* be able to transfer between 1 and 3 OR between 2 and 4 without clearing security since 1 and 3 use the same security checkpoint and 2 and 4 use the same security checkpoint, but even this is dependent on the set-up that is currently in use both by TSA and when you get off the tram. IIRC, I've seen both (where you could and where you couldn't transfer), but my memory could be fuzzy. I flew out of MCO quite a bit from 2005 through 2010 but haven't flown there since.