- CKI at JFK: efficient, but OLCI or kiosks don't seem to work, confirmed by CKI staff (which makes you wonder why they put kiosks up)
- Security: normal JFK. Traveling in C, you get to use the fast lane
- Lounge: very spacious, ample seating opportunities, with a nice view on the tarmac. No free WiFi, drinks and food offering is poor, magazines and paper OK
- Boarding usually efficient if you travel in C, they make a separate line for C class pax
- Seats on board: lie flat and large. There are currently two versions of the C class seat, NEV2 and NEV3. I prefer NEV3 as it does have a foot rest, so you don't slip from the slightly angled seat. Storage space is fine.
- IFE: depends if you have the old or the new version. New version has more choice. In both cases, choice of movies, TV series, games, music. Screen size is comfortably wide. Headseats are okayish, but if you have your own noise-cancelling headphones, bring them
- Food: terrible!!!! Contrary to what the previous two people wrote food in C on that route is a disgrace, all the more from an airline that portrays itself as an ambassador of French art of living and French cuisine. No choice of appetizers, main dishes are usually just plain bad, you get served cheese on your plate right from the start (for a Frenchman that is equivalent to the check being brought with your appetizer for an American), dessert and bread usually good. IIRC no choice of desert from the trolley for the night flight out of JFK. In any case, if you care for food, don't eat on the plane. It's gastronomic terrorism.
- Amenity kit: nothing to write home about. Everything you need is in there, but products are nothing special. Nice touch: the shoebag
- Service: FAs typically very classy, very corteous, many of them also very friendly - but you might just as well get the opposite, the type that makes you feel you are there at their grace. But even then they have an aura of class and always corteous. Not very attentionate, they may pass by your empty glass six times without picking it up. But overall no complaints
- Air France specialty: if you fly in C, don't be surprised that the empty seats around you suddenly get filled with people from behind the curtain (=Y cabin). Those are the buddies of FAs. New YOrk is one of the worst routes, because everybody seems to know someone who travels to NYC, and then does an "after pushback upgrade".
- If you have status like Elite or Elite Plus, don't expect any special treatment
- Arrival in Paris: take your time. The jetty won't be available before at least 10 minutes after the plane's been parked (arrival of planes seems always a big surprise to ground staff in CDG). If you go through immigration in CDG, you'll get to use the Acces No. 1 fast lane. Caution: it is not labelled as "Fast lane" or "Business Class" or anything like that. But just show your C class boarding pass and you can use it.
- Baggage delivery: usually around 15 mins wait time, sometimes more, seldomly less. Don't expect priority-labelled luggage to arrive first, it just comes... whenever.
I haven't used DL on an intercont flight, so I can't compare.
Hope this is helpful. Otherwise, do a search on this forum, you'll find the good and the bad of flying AF in C. Overall it's okayish. If you go from New York with Paris your final destination, it's a good option. If you only change planes in Paris to travel somewhere else, think about another airline and another transfer airport. Paris is - for good reason - systematically ranked among the world's 10 worst airports (Kabul being No. 1, Baghdad No. 2, just to give you a flavour of the league CDG is playing in).