"Centrage"
I flew back yesterday CMN CDG TLS.
The flights were uneventful, but very crowded and bothersome : I had to put my roller under the seat (and to have it between my legs) both legs.
Maybe some destinations are full and others not.
About "centrage", I mean seating passengers in the aft part of the plane, it is very common when the plane is not very loaded, and has a long "body" (for instance A 321).
It is common at certain hours on the TLS/ORY or CDG flight, and at other hours the plane is crowded.