AF asks for an ID for both domestic and international.
This checking occurs at check-in and an other time just before bording.

UA at CDG :
ID check at X-ray before check-in.
Luggage search at the same stage.
ID check at check in.
ID and boarding pass check when moving to the satellite.
ID check at the Police check point.
ID and boarding pass check at Hand luggage X-ray check point
ID and boarding pass check at bording gate.
ID and barding pass check again at the gate of the plane.

Boy , if you are a terrorist , it’s hard to make it !!!