I need to fly from PIT to JFK on Delta and then connect to Air Lingus to Shannon. I prefer for PIT to JFK be nonstop. I will need to change from terminal 3 to terminal 4. I am buying the domestic and the travel group is buying the international. Because I've had several 2 hour delays here is my question. I can take a flight that will give me 2 hrs 20 min or a flight with 10hours 40 mins. What should I do? I'm not familiar with the airport or how to get form T3-4 or how long it will take.