I'm planning a trip to Paris Nov. 25 to Dec. 1 for Thanksgiving. This is on my own money so I'll be flying coach. Which airline would you choose, based on overall experience?

KLM ~$324 via AMS on a 767 and 737
Delta ~$493 direct (AF metal but DL flight number) on a 777 OR
Delta ~$414 via CVG on a 737 and 767.
CO ~$501 via EWR on a 777

Any help and advice is appreciated. Thanks!

-Maria