Radar Replaced at Boston Airport

An airport radar system that collapsed at Logan International Airport in Boston, delaying hundreds of Easter weekend flights, was replaced, and the new radar was tracking flights. The Airport Surveillance Radar 9 system, installed in 1991, was used by air traffic controllers to track weather and planes within an eight-mile radius of Logan. It was built to withstand hurricane-force winds but collapsed Saturday morning under winds half that strength. Air traffic controllers switched to a slower backup system that allowed for about half the airport’s usual capacity. More than 500 flights were canceled, and hundreds of others were delayed.