I will be arriving at Terminal 3 from the US via Delta and going to Catania on Alitalia from Terminal 1(single itinerary flight). I also have a single itinerary return trip from CTA to FCO at Terminal 1 and then take Delta to the US from terminal 3. Given recent changes made to the checking counter for Alitalia as well as Delta, I would preferably try to get the e-boarding passes from my Delta app. for both the domestic(FCO to CTA and vice versa) as well (Atlanta, USA to FCO and vice versa). I will have no checked luggage. On arrival to Italy from the US, my layover is 2hr45min and on return it is 1hr45min. Will there be an issue in making the transfer? How much time will I spend on my arrival for passport control and also during departure? I guess I won't have to do security clearance on the transit to T1 fromT3 inside the secured area and same way on my return flight.