Air Mail service erected due to frozen waters. Letter sent from Holte to Struer 10 February 1922 bearing two 20 øre Christian X issue, paying 20 øre letter rate and 20 øre Air Mail charge. The plane flew between Aarhus-Samsø and Kalundborg. The Air Force established a tent camp at Gisseløre near Kalundborg and an “Airport” was made directly on the ice.