A quick check of the seat map showed that there are 6 Preferred seats left, as well as many of the exit row seats. And, according to seatcounter, F is definitely sold out. I'm thinking the odds are against you on this one. CLT-LGA is typically a very elite heavy route, as well, so there are probably more Chairman's, Platinums, and Golds ahead of you on the list.

Safe travels.