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This study describes the start/unstart characteristics of a finite and rectangular supersonic biplane wing. Two wing models were tested in wind tunnels with aspect ratios of 0.75 (model A) and 2.5 (model B). The models were composed of a Busemann biplane section. The tests were carried out using supersonic and transonic wind tunnels over a Mach number range of 0.3 ≤ M∞≤ 2.3 with angles of attack of 0°, 2°, and 4°. The Schlieren system was used to observe the flow characteristics around the models. The experimental results showed that these models had start/unstart characteristics that differed from those of the Busemann biplane (two dimensional) owing to three-dimensional effects. Models A and B started at lowerMach numbers than the Busemann biplane. The characteristics also varied with aspect ratio: model A (1.3 < M∞≤< 1.5) started at alower Mach number than model B (1.6 < M∞ < 1.8) owing to the lower aspect ratio. Model B was located in the double solution domain for the start/unstart characteristics atM∞ = 1.7, and model B was in either the start or unstart state at M∞ = 1.7. Once the state was determined, either state was stable. [ABSTRACT FROM AUTHOR]