Air traffic controllers across the country have grappled with radar and communications outages for years, CNN review finds.

Controllers handling aircraft headed into Newark Liberty International Airport lost radio frequencies for approximately 2 seconds, said the FAA

A veteran air traffic controller who was alone during the terrifying 90-second blackout at Newark Liberty International Airport refuses to fly out of the travel hub anymore — saying it’s

“The FAA, the airlines, and all of the supporting people have worked diligently to make air travel safer, and it’s never been safer," he said. And that's part of the reason there are more delays and cancellations as air traffic control equipment falters.

Major airline CEOs are calling on Congressional lawmakers to upgrade the nation's air traffic control systems, especially after recent widespread issues at Newark Liberty International Airport. The top executives sent the open letter to Congress on Wednesday,