The shortage on Monday forced the F.A.A. to delay flights to the busy airport for up to nearly seven hours, the latest problem to plague the airport.

As disruptions at Newark continue to mount, outdated technology and an air traffic controller shortage are receiving national attention.

The airport, which serves as a critical transportation hub for the New York metropolitan area, has seen more than 1,400 flights delayed or canceled during the seven-day crisis. On the worst days, over 40% of flights were delayed and 20% canceled entirely, creating ripple effects throughout the U.S. air transportation network.