I am arriving Rome airport from JFK on Alitalia. I booked and paid in credit card a first class roundtrip JFK-Rome ticket on Alitalia. Since I had Alitalia frequent flyer miles, I decided to book a one-way flight from Rome to Venice with the miles. Therefore, the roundtrip JFK-Rome leg has a different booking number than the one way Rome to Venice leg. I have 1 hour 40 minutes to make the connection from T3 (arrival in Rome) to get to T1 (to take off from Rome to Venice). Alitalia said that the agent in JFK "should" be able to print my boarding pass for the Rome to Venice flight, at the same time they print my boarding pass for the roundtrip JFK-Rome, Rome-JFK flight. The word "should" makes me worried. If I have all my boarding passes pre-printed, will 1 hour 40 minutes be enough time? I only have carry-on luggage, no checked bags. If they can't print my boarding pass for the Rome-Venice leg in the United States when I show up at JFK, how do I this when I get to Rome airport in order to board the flight from Rome to Venice? And will 1 hour 40 minutes be enough time? Thank you.