Ars Technica reports that the FAA has expanded its AI-based SMART advisory tool, which suggests flight routes and arrival sequencing, from the Washington, DC area to air traffic centers nationwide. The FAA credits it with rerouting 180 flights and saving about 10 minutes and 80 gallons of fuel per flight, though the controllers' union says it was not consulted on the system, and a human FAA team validates its recommendations.