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 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.
