How can you confirm its the same aircraft?
Just because flight numbers are the same means nothing. Happens lots between Europe and the US maybe hasn't happened at MAN before.
Take MAN-JFK-PIT, DL are not going to keep passengers on the same aircraft for 2h19m so the same plane which suspect wont happen means nothing. Passengers will have to do what all connections do.
The DL website says you have to change planes in JFK