At times Monday evening, as few as three air traffic controllers per hour were lined up to monitor via radar the planes flying into and out of the airport, the Federal Aviation Administration said.

The award-winning new Terminal A may be the pride of Newark Liberty International Airport. But behind the scenes, the technology that’s keeping the planes in the sky is frighteningly out of date. Some of it relies on floppy discs and used parts sourced from eBay, federal officials said this week.

Nearly 80 flights have been cancelled and more than 40 delayed at Newark Liberty International Airport after yet another an equipment outage brought more chaos to the NYC-area hub.

Similar to last summer, there is currently a nationwide shortage of air traffic controllers, which will “take time” to replenish, according to Transportation Secretary Sean Duffy.

Passengers traveling in and out of Newark at the end of the week shouldn't expect smooth sailing. Here's the latest at the New Jersey airport.

“I equate a good, A-level, traffic controller that can handle a place like Newark, JFK, LAX, San Francisco, to a three dimensional chess player who can juggle a chainsaw, an axe, a sword, a razor blade with his eyes closed,” Aero Consulting Experts CEO and a former United pilot Ross Aimer told Fortune.

The air traffic system meltdown at Newark Liberty International Airport last week “was the most dangerous situation you could have,” according to an air traffic controller on duty that day, as the fallout from the outage stretches into a second week.

The Federal Aviation Administration recently announced a three-year plan to upgrade air traffic control systems nationwide.

A reporter asked Duffy on Monday why the first Trump administration chose not to address the air traffic control system during his first term in office, noting that Duffy said it was a “decades-old” problem. However, Duffy’s answer left many users on social media scratching their heads.

Air traffic controllers handling flights approaching and departing Newark Liberty International Airport experienced another outage early Friday morning. The blackout included losing radar for about 90 seconds at 3:55 a.m. local time, the Federal Aviation ...