List of accidents and incidents involving commercial aircraft 1960 – 1989
June 29 – In the 1972 Lake Winnebago mid-air collision, North Central Airlines Flight 290, a Convair CV-580, and Air Wisconsin Flight 671, a de Havilland Canada DHC-6 Twin Otter, collide over Lake Winnebago near Appleton, Wisconsin, killing all 13 people on board the two aircraft.