The US government has expanded the use of an AI tool for advising air traffic controllers to assist in managing air traffic across the entire national airspace system. Airline executives have voiced support for the rollout, but the US labor union representing air traffic controllers has said it was not involved in designing or testing the AI-driven system. The Federal Aviation Administration (FAA) says the $875 million SMART system has helped reroute 180 flights since being implemented in airspace over Washington, DC, on September 21…