There are many business markets from JFK, though no where near the amount from LGA. Besides LAX, SFO, and LHR, pretty much every west coast city, Asia, Europe, and South America, can be considered a business destination. There are many hub flights from the likes of DL, AA, TW, NW, and CO into Kennedy. This doesnt include AAeagle, Comair, ASA, and ACJET service from many large east coast cities (BOS, DTW, CLE, PIT, etc).
With the emergence of Jetblue, we now have N/S service to many of the destination that did not receive it in the past. LGA is getting worse and worse with delays, would u rather spend 2 hours on a taxiway, or the extra 20 minutes to JFK? My hope is that this will lead to further growth at JFK.
727, L1011, MD80, A300, 777-200, 737-300, 737-700, 747-400, 757-200, 737-800, A320. E190, E135, 767-200, CRJ9