Originally Posted by
spinmeister
TNow I'm on to the flight compensation matter with DL and looking into EU or UK261.
Go after all of them as one of the other posters mentioned. At a minimum you should be able to get comp from DL for the EU261 because of the CDG-JFK cancel. That is pretty straightforward. Then you should also be able to claim with BA due to their delay, missed connection and late arrival at destination.
And as mentioned - still pursue the refund from DL for the class of service downgrade. Its not your fault your flight was canceled and they had no other option.