DL needs to get a lot of things ironed out on the AF "alliance". I had a nightmare in CDG in January when we had bad weather in the South and my DL CDG-ATL flight was cacelled. AF gave me a run-around getting rebooked via ORD, separate computer systems was the apparent reason. It took a call to DL to get it fixed (which they quickly did).
Also, connections in CDG compared to ZRH (I used to fly SR codeshares quite a bit) are a real pain in the ...