The FAA is preparing for more possible ground stops and delays at several major airports amid air traffic controller shortages in the government shutdown.

A ground stop has been issued Reagan National Airport Tuesday due to a security issue, according to the Federal Aviation Administrations (FAA) National Airspace System Status website.

Data showed a “broader slowdown” Thursday across the country's aviation system for the first time since the shutdown began on Oct. 1, according to aviation analytics firm Cirium.

Air traffic controllers are coping with grueling six-day workweeks, mandatory overtime and chronic understaffing — all while working without pay.

The ongoing shutdown has left air traffic controllers unpaid, forcing FAA ground stops and major flight delays across the U.S.

A shortage of air traffic controllers caused more flight disruptions Monday around the country as controllers braced for their first full missing paycheck during the federal government shutdown.

Tyson Airport are entitled to back pay, but they must rely on their own savings, loans and charity efforts in the meantime.

Transportation Secretary Sean Duffy predicted that there could be chaos in the skies next week if the government shutdown drags on and air traffic controllers miss a second paycheck.