Originally Posted by
NC Flyer
Furthermore, there are plenty of fares rules which make it clear that JFK/LGA/EWR is treated as the same place.
Actually, according to this thread EWR is technically distinct (albeit perhaps not practically):
DEN RCC Rep: "I will lose my job if I put you on that flight"
Of course that doesn't change the fact that JFK/LGA are generally the same, as you say.