A/S Aero was a Norwegian airline company founded by Tancred Ibsen in January 1920. The company was financed by Tancred Ibsen's uncle, businessman Einar Bjørnson, and two shipowners. Despite the A/S (for private company limited by shares) in its name, A/S Aero was never formally registered as a limited company. During the summer of 1920 A/S Aero successly operated demonstration, advertising, and limited mail flights from the Bestumkilen bay in Oslo, with Tancred Ibsen as the head pilot. The company also chartered out airplanes to serve the Det Norske Luftfartrederi routes in southern Norway.