Gotta disagree with this. I take Amtrak BWI-NYP every other week and it's night and day as far as convenience. The flight is much faster than the train, so time-wise it's probably a wash, but the train is very comfortable; big comfy seats, power at every seat, a dining car. You also don't have to show up 1+ hours early to get through security. Also, if you're staying in Manhattan the cost of an Uber or the amount of time it take to take public transit from JFK to Manhattan and back adds another level of burden.