Moving air traffic controllers means retraining them on the quirks of a new facility, and the process can take years.

Newark International Airport experienced yet another day of cancellations and delays Monday, after experiencing another communications issue on Sunday. Department of Transportation Secretary Sean Duffy said Monday that an FAA software update pushed out Friday night allowed backup systems to kick in Sunday when a main communications line went down.

The Federal Aviation Administration is considering temporary flight reductions in and out of Newark Liberty International Airport, and it's launching a safety task force.