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

The radios and radar keep going out at Newark International, and it's part of a broader crisis in air traffic control. It happened again Sunday, when flights in and out of the New Jersey airport were halted for 45 minutes after radar screens briefly went dark. The Trump administration is working desperately to fix the larger problem.

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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control system in the wake of recent deadly plane crashes and technical failures that have put a spotlight on the outdated network.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.

Plans for a new air traffic control system were announced Thursday by Transportation Secretary Sean Duffy amid a spotlight on the out-of-date ATC system and the air traffic controller shortage.

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.