Major delays are piling up at airports across the United States as air traffic controllers and TSA staff, working without pay during the ongoing government shutdown, have begun calling out sick.

A video shared by ABC News’ Gio Benitez shows long lines of frustrated travelers, as the weekend brought some of the worst travel disruptions since the start of the shutdown. More than 5,000 flights to and from US airports were delayed on Sunday alone.

According to the Federal Aviation Administration (FAA), staffing levels are “strained” at several airports, including in the New York City area, where around 80% of controllers didn’t show up for work on Friday.

Flights across US face major delays

In an evening update, the FAA said half of the country’s 30 busiest air traffic facilities, known

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