In an effort to reduce carbon emissions, France has outlawed domestic short-haul flights if trains can be used instead.
Two years after lawmakers decided to end routes where it would take less than 2.5 hours to do the same trip by train, the law became effective.
While connecting flights are unaffected, the embargo virtually eliminates air travel between Paris and places like Nantes, Lyon, and Bordeaux.
The restrictions “will only have minimal effects” on CO2 emissions, according to critics.