France has passed a law banning some domestic flights and encouraging travelers to take the train instead. Under the new law, flights that can be replaced by a train journey of under two-and-a-half hours should be scrapped.

The ban on short-hop flights became law on Tuesday. However, France’s national airline had already canceled three routes that were deemed too high on carbon emissions. All three went from Paris’ second airport, Orly, serving Bordeaux, Lyon and Nantes. Those three cities are all on the country’s extensive high-speed rail network, and taking the train is also far faster than flying there.

Air France agreed to drop those direct routes in return for coronavirus financial assistance from the government in 2020.