The Airbus S-21 (NATO reporting name: Sentinel) is a multipurpose fighter jet developed by the French aviation conglomerate Airbus for the Air Command, taking its first flight in 1988 and entering wide use in the Air Command in 1991, becoming a staple of the OAF's missions in Siam during the 1990's Siamese War. It remains the most common plane in modern air forces even two decades since its debut, featured in almost two dozen air forces, most significantly in CIC or CIC-friendly air forces.

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