As far as going through Manhattan,it doesn't look good. EWR arrivals delays are common,as the way the winds are will detirmine if you'll get a "straight shot" in or be doing a long oval to enter the runway pattern...which can add 20-25 minutes to your arrival time. Been there done that more times than I can count. Even assuming you hit the gate on the advertised,you won't really be on the road for at least 30 minutes. If you're at terminal "A" in EWR,the busses will stop aand make pickups at terminals "B" and "C",further slowing you down. Quick ride from EWR to the Lincoln tunnel,but a crawl fro there to midtown. Figure an hour from "moving" to midtown Manhattan,and at least the same to JFK from midtown. I'm just trying to be realistic,as it sure beats ripping your hair out as you putter at 10 mph thu traffic. The fastest route would be direct from EWR,south on 95 to the Goethels bridge,accross Staten Island,over the Varrazzano bridge and the Belt Pkwy to Kennedy. At that hour a cab will get you there in time,but will cost big $$. Just don't dilly-dally getting from the plane to the cab. Maybe Olympia Trails runs a bus to JFK from EWR using that route. Good luck.