I wish you all the required luck (I happen to work in that zone, in Guyancourt) But I would even trust the plane to arrive there that day

Update: The plane did land 5 min before the enforcement of the no-flight zone (!), but then RER B did function (albeit sloooowly). Not many people on the train or in the station. Same for T3a and M13. Did get home about 2h after landing, I had it worse on normal days!

*Would not Sorry, butter fingers