Tampa, Miami, Denver, Houston and dozens of airports nationwide–have experienced air traffic control outages 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."

To recap, on April 28, air traffic controllers handling inbound traffic at Newark experienced a brief radar and radio outage. Similar failures have occurred at least three times since then, and in response,