MR.777 -
Just a bit of info for you, not sure if they still do it but Prem Gold customers were allready pre-seated before you checked in, it was allways done in advance by HQ.
Seats use to be allocated booking by booking, so the first lot of customers to book prem gold would be allocated the seats by the window (depending on group size of course) and then so on so on. They will do all possible to seat you together but dont think this is a guarantee. i would suggest tho getting to airport for say 2hrs before if not earlier. Even tho ur prem gold, check in will still be open at the usual time and as only 1 prem gold desk, can get a bit busy around the 90mins before mark.
Enjoy Cancun and enjoy your flight, definately well worth the money in prem gold, you will love it.
Cheers