The Federal Aviation Administration (FAA) is looking into an incident where pilots approaching Denver International Airport briefly lost communication with

The FAA said in a statement that the Denver Air Route Traffic Control Center lost communications for approximately 90 seconds. McIntosh said both the primary and main backup frequencies went down, so the controllers had to turn to an emergency frequency to communicate.

A radio failure Monday at the Denver Air Traffic Control Center temporarily affected communications, according to the FAA.

Denver ATC communication loss affects several pilots, sparking FAA investigation. The incident highlights ongoing air traffic control system issues and modernization needs.

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.

The FAA said in a statement that the Denver Air Route Traffic Control Center lost communications for approximately 90 seconds. McIntosh said both the primary and main backup frequencies went down, so the controllers had to turn to an emergency frequency to communicate.

The Federal Aviation Administration said on Thursday that Denver air traffic control lost communications for about two minutes on Monday but was able to maintain contact through an emergency frequency.

The revelation comes months after the midair collision between a commercial jet and an Army helicopter killed 67 people, raising questions about military aircraft in the congested capital airspace.