The last RER train from Aeroport Charles-de-Gaulle leaves at 23h48. Then there're night buses (Noctilien) leaving twice an hour to Gare du Nord. I was able to find that on the website ...
I have a plane ticket including a rail@fly ticket for the Deutsche Bahn (DB). I want to use a City Night Line train, which has a compulsory reservation. But where can I find this reservation option? ...