The U.S. Justice Department filed a brief in federal appeals court Tuesday to overturn a federal judge's decision that declared the government mask mandate on planes, trains and buses unlawful. Here, a sign stating that masks are required at San Francisco International Airport stands in a terminal after the federal mask mandate was overturned.

The U.S. Justice Department filed a brief in federal appeals court Tuesday to overturn a federal judge's decision that declared the government mask mandate on planes, trains and buses unlawful. Here, a sign stating that masks are required at San Francisco International Airport stands in a terminal after the federal mask mandate was overturned. / Getty Images

Updated June 1, 2022 at 3:54 AM ET

The Justice Department asked a federal appeals court on Tuesday to overturn last month's court decision by a federal judge that declared the mandate requiring masks on airplanes and other public transportation unlawful.

In a 48-page document filed in the 11th U.S. Circuit Court of Appeals, the Justice Department argues that the order issued by the Centers for Disease Control and Prevention in early 2021 "falls easily within the CDC's statutory authority."

Last month, the Justice Department said that it would appeal U.S. District Judge Kathryn Kimball Mizelle's decision to strike down the CDC's mask mandate for public transportation if the agency determines the mandate is still needed to protect public health.

"None of the district court's quarrels with the CDC order comes close to showing that the CDC has acted outside the 'zone of reasonableness,'" the Justice Department said in the brief.

"The findings in the CDC order provide ample support for the agency's determination that there was good cause to make the order effective without delay."

The CDC did not immediately respond to immediate requests for comment on the issue.

In her ruling, Mizelle argued that the mandate violates the Administrative Procedure Act because the agency failed to prove its decision regarding implementing the mandate.

"The court concludes that the mask mandate exceeds the CDC's statutory authority and violates the procedures required for agency rulemaking under the APA," Mizelle wrote.

Transportation companies, such as Uber, Lyft and Amtrak; as well as Delta, Southwest and American Airlines made masks optional soon after the decision.

NPR's Ayana Archie contributed to this report.

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Tags: mask mandates  airplane  Travel  U.S. Justice Department