Likelyhood of changing return flight by a day
 

I am traveling with family of 5 on JFK to MXP in feb. Booked the cheaper flight available, but hoping i can find a way to get a return flight changed once I'm at the airport? Any ideas for getting this done?

What are the fare rules for your specific tickets? That will determine whether a change can be made at all and what, if anything, it will cost.

Without the fare rules information, nobody here can advise you.

It's easy enough to change - just walk up to the ticket desk and request it. However, the change fees and any price difference that will have to be paid means you'd be better off booking the flights you want from the start, or travelling the day before/after your preferred date.