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With a retractable landing gear, powerful engine and weapons alongside other improvements, the Fokker D.21X was a major improvement over the D.21.
It served in the fight over the Netherlands in 1940, proving to be a match to the Luftwaffe fighter force.
Some of them escaped to the UK and served in the RAF in the Battle of Britain until replaced by newer aircraft.
The D.21X also served in the East Indies against invading Japanese forces and from Australia from then on.