Forty years ago this week, American Airlines Flight 191 crashed at O’Hare International Airport shortly after takeoff. The tragedy killed all 271 people on board, and 2 people on the ground. It’s still the deadliest plane crash ever to occur in the U.S., and Chicago Tribune reporter Lauren Zumbach writes that it “changed air travel forever.” She talks with WBEZ’s Greta Johnsen about the crash and its legacy.