American Aviation at Coeur d'Alene Airport in Idaho offers modifications for Beechcraft King Airs, Piper Cheyennes and Cessna Conquests. For King Air 100, E90, F90, 90, A90, B90 and C90 through the 1983 C-90-1 series aircraft, the mods include Ram Air Recovery System, streamlined oil-cooler cowlings and aerodynamic speed stacks. Cheyenne I, II and IIXL models can get aftermarket exhaust pipes and Ram Air Recovery Systems, while the exhaust-pipe upgrade is available for Conquest Is. "All of the systems are designed to increase the climb and cruise performance," says company vice president Jim Christy.
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机译：爱达荷州科达伦机场的美国航空对Beechcraft King Airs，Piper Cheyennes和Cessna Conquests进行了修改。对于通过1983年C-90-1系列飞机提供的King Air 100，E90，F90、90，A90，B90和C90而言，该模块包括Ram Air回收系统，流线型机油冷却器整流罩和空气动力学速度堆栈。夏安I，II和IIXL型号可以使用售后市场的排气管和Ram Air回收系统，而Conquest Is可以进行排气管升级。公司副总裁吉姆·克里斯蒂（Jim Christy）说：“所有这些系统都是为了提高爬升和巡航性能而设计的。”
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