The union representing the nation's air traffic controllers is directing its members to keep working during the U.S. government shutdown now stretching into its second week , with the labor group warning that failure to report for duty could lead to termination.

The National Air Traffic Controllers Association (NATCA) told members Monday that it discourages federal employees from taking any actions to compromise air safety. The group represents more than 20,000 air traffic controllers, engineers and professionals in aviation safety-related roles.

"Air traffic controllers and other aviation safety professionals take their responsibility to protect the safety of the flying public very seriously. Participating in a job action could result in removal from federal service," NATCA said in

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