.....did you already have seats pre-booked?
I've just read that a way to get an upgrade is by NOT pre-booking your seats. If your seats ARE pre-booked, they cannot be changed.
DH and I are going to NYC for 6 days sans children in December and as this is likely to be a once in a life time (and I'm only talking about the child free trip here....) I would love to try for a cheeky upgrade.
Any expert flyer tips.......?