The United States aviation industry continues to grapple with the worst air traffic controller shortage in nearly 30 years as a recent spate of incidents has thrust the high-stress profession into the spotlight.

The Trump administration has announced a plan to replace the country’s aging air traffic control system with an all-new technology—but needs Congress to allot tens of billions of dollars.

The shortage of air traffic controller specialists is one of the reasons for the hectic week at Newark Liberty International Airport.

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

The Trump administration has proposed a multibillion-dollar overhaul of the U.S. air traffic control system in the wake of recent deadly plane crashes and technical failures that have put a spotlight on the outdated network.

The “shell-shocked” controllers who guide planes in and out of Newark airport work in constant fear of radar systems’ going down, a recently retired controller told NBC News.

Caught in the middle of the issues at Newark is United Airlines, which is the most active airline at the New Jersey airport. While the problems lie with the FAA system, the airline is where people often aim their frustrations over cancellations and delays.