The makers of the advanced radar systems promise to do the same for other airlines — along with sparing passengers from gut-churning turbulence and reducing lengthy delays. Rockwell Collins says its MultiScan ThreatTrack radar system is the first to detect not just severe turbulence but also more moderate bumpiness that is safe to fly through, although not comfortable for passengers. Bill Lusk, a Boeing 737 captain and the manager of daily operations for Southwest Airlines, says the new system improves the safety margin, helps pilots provide a smoother ride for passengers, and saves on fuel. Older systems do a good job of capturing the basic characteristics of a storm — its height, shape and intensity — but the newer ones make it easier to pinpoint the location of the worst weather, says Erik Eliel, a pilot for a major airline who also trains other pilots on radar. Last year, 11 passengers and 13 crew members on U.S.