Jonathan Stewart was badly shaken by a recent close call in airspace around Newark, N.J. “I don’t want to be responsible for killing 400 people,” he said in an interview.

US aviation safety regulators are investigating a communications outage affecting flights approaching Denver International Airport earlier this week, the latest in a series of glitches that have put a spotlight on the nation’s aging air traffic control system.

Much has been made over the recent air traffic control system failures at Newark Airport, but in reality, the problem goes back a long time. According to a new report from CNN, air traffic controllers "repeatedly" warned of major safety issues and technology outages as early as last summer,