Air traffic controllers across the U.S. are continuing working without receiving full pay as the federal government shutdown enters its third week. The lack of pay for the notoriously high stress job has prompted growing concern over aviation safety and staffing levels.

On Monday night, the FAA issued a ground stop for Austin-Bergstrom International Airport in Texas due to staffing constraints, according to a Reuters report. The alert, which began shortly after 8 p.m. local time, temporarily halted departing flights and underscored the increasing strain on the nation’s air traffic control system as the shutdown continues.

At airports in Washington, D.C., New York and Chicago, controllers stood outside terminals Tuesday morning, handing out flyers to travelers explaining the effects of th

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