Air traffic control staffing has been under a microscope since the shutdown started, but it's not necessarily the main driver of flight delays.

Half of major US airports are experiencing staff shortages and delays.

Transportation Secretary Sean Duffy said Sunday that the government shutdown, now in its sixth week, would continue to cause flight delays, cancellations and closures amid air…

Air traffic control staffing has been under a microscope since the shutdown started, but it's not necessarily the main driver of flight delays.

Sean Duffy said that a lot of his air traffic controllers can manage missing one paycheck, but two is another matter.

There have already been numerous flight delays as the FAA slows down or stops traffic when it is short of controllers.

Transport secretary says 35-day shutdown is causing severe air traffic controller shortages and warns of ‘mass chaos’

As the shutdown cancels even more flights, lawmakers are under increasing pressure to reach a deal.