The Citabria traces its lineage back to the Champ. The most noticeable external changes to the design are the Citabria's squared-off rudder surface, wingtips, and rear windows. Like the Champ, the Citabria features tandem seating. The fuselage and tail surfaces are constructed of welded metal tubing. The outer shape of the fuselage is created by a combination of wooden formers and longerons, covered with fabric. The cross-section of the metal fuselage truss is triangular, a design feature which can be traced all the way back to the earliest Aeronca C-2 design of the late 1920s.