You could reasonably get to JFK in an hour either by subway or taxi, though it doesn't leave much room for error (you'll beat the rush hour crowd, at least). Personally, I wouldn't be able to enjoy the show with that stress hanging over me, but not everyone is as high strung as me.
eta: Eris, true, but a lot of airlines allow for online check in which you really don't have to be at the airport until 30 minutes before the flight, especially if you're not checking luggage.
Updated On: 4/13/09 at 02:40 PM