The U.S. Federal Aviation Administration received 6,000 applications for air traffic control roles in the last 12 hours, Transportation Secretary Sean Duffy said on Friday.

The FAA opened applications for air traffic controller positions overnight, Duffy said.

The U.S. air traffic control system in the U.S. is stretched thin. Many controllers are working mandatory overtime ​and six-day weeks and the FAA’s air traffic control training academy ⁠faces serious issues with retaining students.

The Trump administration is aiming to recruit gamers for air traffic control positions, Duffy said.

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(Reporting by Courtney Rozen; Editing by Chizu Nomiyama)