Aftermath was based on a real life midair plane collision that happened on what date?
Aftermath (2017 film):  The film is based on the Überlingen mid-air collision though the names, places and incidents were changed. Überlingen mid-air collision: On 1 July 2002, Bashkirian Airlines Flight 2937, a Tupolev Tu-154 passenger jet, and DHL Flight 611, a Boeing 757 cargo jet, collided in mid-air over Überlingen, a southern German town on Lake Constance, at 23:35 local time.
1 July 2002