Air traffic controllers in Denver had to scramble to use backup frequencies after their main communications lines went down for 90 seconds earlier this week in the latest Federal Aviation Administration equipment failure.

An FAA spokesperson disputed the Post's report that the Newark control tower was operating with "bare bones" staff despite the ongoing chaos at the New Jersey airport

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.