Password: I agree with "mikesown" - flying into Syracuse and taking the shuttle to Cornell is the way to go (even if you have to transfer planes to get to Syracuse). I like the Ithaca airport but it is too sensitive to weather... when it works, it's the best - however they have many delays.
I see you're from San Jose. To give you an example of how far JFK is from Ithaca - if you were to drive directly from JFK to Ithaca - it's about the same distance/time as if you were to drive directly from San Jose to Santa Barbara. Of course, you won't be driving directly - you have to get to Port Authority and wait for a bus, deal with NYC area traffic, etc... your day will be incredibly long and tiring.