France has banned short-haul flights to destinations where the same journey can be made by train in under 2.5 hours. https://www.bbc.com/news/world-europe-65687665
France bans short-haul flights to cut carbon emissions

All domestic air routes are stopped where the same journey could be made by train in under 2.5 hours.

@kottke Sigh. A specific distance would have been more robust, wouldn't it. My pessimistic self is now betting for train connectivity to deteriorate past the 2,5h limit at some point, re-enabling short-haul flights.
@mhartle the TGV would pretty much have to stop operating for that to happen.