It’s not just Newark—dozens of air traffic control outages have occurred at U.S. airports nationwide in recent years.

Major airline CEOs on Wednesday called on Congress to approve billions of dollars in funding to modernize the United States' aging air traffic control system, saying it is "failing Americans." The Federal Aviation Administration's air traffic control network's woes have been years in the making.

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