The Aeronca 15AC Sedan is a light airplane that was manufactured by Aeronca Aircraft from 1948 to 1951. It has conventional landing gear and can carry up to four people. Although it was primarily designed for personal use, it was also used in utility roles, including bush flying. The Sedan was the largest aircraft produced by Aeronca and the last design that the company put into production.

The fuselage and tail surfaces of the Sedan are made of welded metal tubing, with wooden formers and longerons covered with fabric forming the outer shape of the fuselage. The triangular cross-section of the metal fuselage truss is a design feature that can be traced back to Aeronca’s earlier C-2 design. The strut-braced wings of the Sedan are made of all-metal assemblies, which was a significant design departure from Aeronca’s previous aircraft. The landing gear is in a conventional arrangement with steel tube main gear and a steerable tailwheel. Bungee cords are used to absorb landing and taxi loads instead of oleo struts.

The Sedan is powered by a Continental C-145-2 or Continental O-300-A engine with 145 horsepower. The Franklin 6A4-165-B3 and Franklin 6A4-150-B3, with 165 and 150 horsepower respectively, are also approved for installation. It has an electrical system, including a starter, as standard equipment. A seaplane version of the Sedan, the model S15AC, was also certified by Aeronca. The standard Sedan has a single-entry door on the right side, while the seaplane version has a left-side door as well.