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.

Radar systems at Newark Liberty International Airport stopped working for about 90 seconds Friday morning, the second major outage for the New Jersey airport.

The air traffic system meltdown at Newark Liberty International Airport last week “was the most dangerous situation you could have,” according to an air traffic controller on duty that day, as the fallout from the outage stretches into a second week.

Air traffic controllers’ radio at Denver International Airport experienced an outage for a minute-and-a-half this week, according to the Federal Aviation Administration (FAA). The

Nearly 80 flights have been cancelled and more than 40 delayed at Newark Liberty International Airport after yet another an equipment outage brought more chaos to the NYC-area hub.

A portion of the Denver air route traffic control center experienced a 90-second loss of communications late Monday, the Federal Aviation Administration said in a statement.

There was another air traffic control outage in less than two weeks at the same Philadelphia facility that directs planes in and out of Newark Liberty International Airport on Friday morning.

The Denver outage is the latest in a series of glitches that have put a spotlight on the nation’s aging air traffic control system.