Last month on a EWR-LAS flight on a 752, on day of travel the seating chart showed 7 open FC seats. I had duly checked in on line 24 hrs ahead, and been placed on the waitlist. At the PC I was told there were now 9 available F seats, and I shouldn't have a problem-- but was still not assigned one (obviously this Plat did not get one at the 5 day EUA mark), I was told to check at the gate. Sure enough at the gate I was given my F seat, and low & behold even after everyone had boarded and the FA's went back to coach and brought up a couple more elites to F there were still 3 empty seats!