Paris next month so trying to verify our return to airport via Rer B. I have been looking at the rer blog: https://www.rerb-leblog.fr/travaux/ and the June to Sept construction plans https://www.rerb-leblog.fr/travaux/
We only will be on rer B June 23 right at noon. As far as I can tell from the blogs and info, the only construction on that day is after 10:45. Does any french speaking person have time to double check that for us.
I guess G7 app is our backup plan, but the rer b would be covered by our navigo Découverte card.