AF staff at CDG handled my recent flight back on DL119. We did not receive pre-boarding as medallions should (I had inquired about it and was told by an agent at the gate that they would make an announcement). Not one announcement was ever made. They opened the gate door and everyone just pushed their way through it. We had to walk down an icy and extremely slippery metal staircase to the tarmack to board a bus. Not one of the AF ground personnal helped any of the eldery people down the stairs. They just stood there and were busy telling jokes and were laughing ( probably about Skyteam and the DL medallion smucks that use them). DL doesn't even rate gate boarding on many of their flights there, what an alliance!