But the day after American Airlines Flight 5342 collided with a U.S. Army helicopter in Washington, D.C., killing all 67 people onboard, shares of the company were trading just 2.5% lower. The decline grew four days later,

Just five days after the deadliest U.S. air disaster since 2001, crews began removing the wreckage from the collision between an American Airlines plane and an Army Black Hawk helicopter. The crash happened on Jan.