On Wednesday, the U.S. Justice Department appealed a judge’s ruling ending a mask mandate on public transportation and airplanes after the Centers for Disease Control and Prevention (CDC) said the measure was still needed.

This comes after a U.S. district judge ruled that mandates, which apply to planes, trains, and other public transportation, were unlawful.

The CDC said it asked the Justice Department to proceed with the appeal and that “an order requiring masking in the indoor transportation corridor remains necessary for the public health.”

Airlines and airports, bus lines, and Amtrak dropped the mandate Monday evening within hours of the TSA announcing that it would no longer enforce the mandate, which was set to expire on May 3.

Meanwhile, the Federal Aviation Administration released the latest unruly passenger numbers. It also announced that the agency’s zero-tolerance policy against unruly passengers would now be permanent.

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