In fairness, Smalls, Flyby talked about PANYNJ traffic for the entire region (LGA,EWR & JFK - you posted JFK only). If you look up the regions' passenger traffic, I would imagine you'd see a big difference in your chart. When he talked about JFK specifically, he referenced "slot portfolios", not passengers. I don't know if you can look up 'slots'. If not, maybe the best you could do would be compare each airlines daily departure numbers.