The incident follows recent radar outages at New Jersey’s Newark Airport due to the FAA’s antiquated infrastructure, adding to safety concerns about flying in U.S. airspace.

The Federal Aviation Administration is investigating a Monday failure of air traffic controllers' radio at Denver International Airport — one of the world's busiest airports, per an FAA statement. Why it matters: It's the latest in a string of alarming tech and safety lapses nationwide that's shaking confidence in the U.