26 January 1947: Douglas Dakota (DC-3), PH-TCR of KLM crashed after takeoff from Copenhagen, killing all 22 on board, including Prince Gustaf Adolf of Sweden (father of present king Carl XVI Gustaf) and American singer and actress Grace Moore.
The delayed KLM flight from Amsterdam had landed at Copenhagen for a routine stop before continuing to Stockholm.
Soon after the Douglas DC-3 aircraft took off, it climbed to an altitude of about 50 metres (150 feet), stalled, and plummeted nose-first to the ground where it exploded on impact.
The investigation showed that the crash had been caused by a forgotten elevator gust lock.
Short of time, the captain never performed his checklist and took off not realising the lock was still in place.
See 1947 KLM Douglas DC-3 Copenhagen accident.

17 November 1957: Vickers Viscount G-AOHP of British European Airways crashed at Ballerup after the failure of three engines on approach to Copenhagen Airport.
The cause was a malfunction of the anti-icing system on the aircraft.

28 August 1971: a Malév Ilyushin Il-18, HA-MOC crashed into the sea while executing an instrument approach.
The main cause of the accident was microburst, a particularly dangerous and unpredictable meteorological phenomenon.
23 passengers and the crew of nine died.
Two passengers survived.
The captain of the plane was World War II flying ace of the Royal Hungarian Air Force, Dezső Szentgyörgyi.
He was due to retire in less than three weeks.
26 January 1947: Douglas Dakota (DC-3), PH-TCR of KLM crashed after takeoff from Copenhagen, killing all 22 on board, including Prince Gustaf Adolf of Sweden (father of present king Carl XVI Gustaf) and American singer and actress Grace Moore. The delayed KLM flight from Amsterdam had landed at Copenhagen for a routine stop before continuing to Stockholm. Soon after the Douglas DC-3 aircraft took off, it climbed to an altitude of about 50 metres (150 feet), stalled, and plummeted nose-first to the ground where it exploded on impact. The investigation showed that the crash had been caused by a forgotten elevator gust lock. Short of time, the captain never performed his checklist and took off not realising the lock was still in place. See 1947 KLM Douglas DC-3 Copenhagen accident.
17 November 1957: Vickers Viscount G-AOHP of British European Airways crashed at Ballerup after the failure of three engines on approach to Copenhagen Airport. The cause was a malfunction of the anti-icing system on the aircraft.
28 August 1971: a Malév Ilyushin Il-18, HA-MOC crashed into the sea while executing an instrument approach. The main cause of the accident was microburst, a particularly dangerous and unpredictable meteorological phenomenon. 23 passengers and the crew of nine died. Two passengers survived. The captain of the plane was World War II flying ace of the Royal Hungarian Air Force, Dezső Szentgyörgyi. He was due to retire in less than three weeks.
Copenhagen Airport