The sole FK.48 was the last airliner built for KLM by the artisanal Koolhoven company, using a surplus FK.40 wing which was literally sawn in halves, interlinked in a gull shape and supported by four struts. Nicknamed 'Ajax', PH-AJX could carry six passengers in KLM service and was mainly used on the Amsterdam - Eindhoven route until it was relegated to sightseeing, air taxi and training duties.