I'm looking at flights from Seattle to Rome in November. Lufthansa has a flight from SEA to FCO via Frankfurt, with a transfer time of 1 hour and 40 minutes. Is that enough time to make the onward flight (provided, of course, that the international flight lands on time)? Both the international flight and the onward flight appear to be operated by Lufthansa.
(Google Flights also shows a Virgin Atlantic (int'l)/British Airways (Europe) combo that has a 1 hour and 50 minute layover at Heathrow, but that seems way too tight for LHR.)