Originally Posted by HJXMAS

Option 1:
AZ to DL Flight at LHR (connection time of 1 Hour, 45 Minutes)

Option 2:
AZ to AF Flight at FCO (connectio time of 2 Hours, 5 Minutes)

I had a hard time finding if AF and AZ are in the same terminal at FCO.

At LHR, I know all skyteam airlines are in the same terminal. I am guessing I would not have to clear customs at LHR but wasn't sure.