There's almost no service from JFK
to Chicago, Dallas, Toronto, Detroit, Cleveland, Denver, Houston, Minneapolis, when I say almost no service I mean less than three daily flights.
As long as Laguardia airport is operational JFK
will never reach it's full potential, Jetblue has changed JFK
tremendously with regards to domestic service. However Jetblue's success only hurts other carriers like AA
from ever establishing domestic service from JFK
of any substance.