Am picking an itinerary to fly from Boston to Eastern Europe - have an option to fly Delta all the way through their new T4 terminal in JFK, have an hour between the flights. Have never been to T4 before - new or old. Will I be able to stay on the airside while connecting (domestic flight arrives into T4)? Any additional security screening in T4 between domestic and international gates? Will Delta check luggage from BOS all the way to the final destination?

As a side - amazngly, cant find a source that would tell me which DL domestic flights fly into/out of T4 - confused.

thanks in advance for the tips.