By David Shepardson

WASHINGTON, (Reuters) – It will take years to fix the interference problems caused by 5G wireless deployment in the C band. A group of major U.S. cargo and passenger carriers told U.S. legislators on Thursday.

Nick Calio is the head of Airlines for America and will testify in writing to a House Transportation and Infrastructure Subcommittee that 5G problems facing the aviation sector should not have been allowed.

His testimony to Reuters, which was not made public by Reuters, states that “the process that led into this operational disaster should be held up in a warning tale of government coordination and communication gone awry.”

Calio says that it will take many years to resolve interference problems caused by 5G deployment in the C band.

Verizon (NYSE:) and AT&T (NYSE:) in January agreed to delay deploying some 5G wireless towers near airports after the aviation industry and Federal Aviation Administration (FAA) warned 5G interference can impact sensitive airplane electronics like radio altimeters.

According to the FAA, 20 model altimeters have been cleared and 90% of U.S. commercial flights are approved for low-visibility approach landings in CBand 5G-zones. However, 5G can impact some flights even in bad weather conditions.

Eric Fanning from Aerospace Industries Association tells lawmakers that there is progress, but the problem is still not solved.

He testified that there were disruptions in the future and that many questions remain unanswered.

Other witnesses include Steve Dickson, FAA Administrator and Meredith Attwell Baker (NYSE:) Attwell Baker).

The committee spokeswoman said that the Federal Communications Commission (FCC), was being invited to give evidence but could not make it. FCC declined to comment immediately.

Baker will inform lawmakers that the wireless industry is “confident” that 5G does not pose a risk to safety of air traffic.

Joe DePete, President of Air Line Pilots Association says that the FCC’s backing of the telecom sector has put “not only the public at danger but also forced pilots into extensive workarounds in order to ensure safety of flight.”

Cathryn Stephens is an official at airport who will speak on behalf of American Association of Airport Executives.