Scandinavian Airlines System Flight 686, a McDonnell Douglas MD-87 airliner carrying 110 people bound for Copenhagen, Denmark, collided on take-off with a Cessna Citation CJ2 business jet carrying four people bound for Paris, France, on 8 October 2001 at Linate Airport in Milan, Italy. All 114 people on both aircraft were killed, as well as four people on the ground.
The subsequent investigation determined that the collision was caused by several nonfunctioning and nonconforming safety systems, standards, and procedures at the airport. It remains the deadliest accident in Italian aviation history.