Just thought I'd let everyone know that the train (RER B) to CDG will be closed for "travaux" (works) a few weekends in September, October and November. You will have to transfer to a bus.

Here is the link to the PDF information (in French).

ATTENTION !

Due to RER commuter train line B upgrade work no trains will run between Aulnay-sous-Bois and Paris-Charles de Gaulle airport on the weekends of 11/12 September, 2/3 and 9/10 October and 6/7 November.

Transilien SNCF advises you to plan one hour more to come to the airport.

A bus service from Roissypole bus station replaces the trains for the duration.