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          The
            prototype Beech 90 King Air was a development of the Beech 80
            Queen Air with turboprop engines.  An unpressurized version was
            sold to the US military as the U-21 Ute.  Electronic reconnaissance
            versions were designated the RU-21.  Other military
            versions include the VC-6 King Air VIP transport and the T-44
            Pegasus multi-engine trainer.
             The King Air family of aircraft has been very
            successful with over 3,000 having been delivered as early as 1981.  |