Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 09:35 and arrives at New York John F Kennedy International Airport at 13:15.
The flighttime is about 9h 40m. The distance travelled ("as the bird flies"): 9566 Km. So the average speed is roughly 990 Km.
There is an 6 hour time difference between Rome and New York