two aircraft to collide
... that in 1976, an air traffic controller error caused two aircraft to collide over Anapa in the Soviet Union, killing all 70 people on board both planes?
... that in 1976, an <a href="./Air_traffic_controller" id="mwAZ0" rel="mw:WikiLink" title="Air traffic controller">air traffic controller</a> error caused <b id="mwAZ4"><a href="./1976_Anapa_mid-air_collision" id="mwAZ8" rel="mw:WikiLink" title="1976 Anapa mid-air collision">two aircraft to collide</a></b> over <a href="./Anapa" id="mwAaA" rel="mw:WikiLink" title="Anapa">Anapa</a> in the Soviet Union, killing all 70 people on board both planes?