On Friday 10 June and Saturday 11 June 2016, the Royal Netherlands Air Force organised its Open Air Days at Leeuwarden air base. The period from Tuesday 7 until Thursday 9 June were rehearsal days.
On 9 June 2016 around 16.15 hours a mid-air collision between two aircraft was reported near Leeuwarden. The collision happened between two aircraft of the Swiss Air Force’s display team Patrouille Suisse. After the collision, one aircraft was able to return to Leeuwarden air base and landed uneventfully. The other aircraft crashed in a pond in the area near Bitgum after the pilot had ejected from the aircraft. The pilot fell through the glass roof of a greenhouse. He was taken to hospital for examination and treatment of injuries.