On 13 October 1970, the German Civil Aviation Authority certified the Bo 105; initial deliveries for the first customers, ADAC Air Rescue and the Bavarian State Police, took place shortly thereafter. In 1972, further type certification was granted by the Federal Aviation Administration (FAA) and the Civil Aviation Authority (CAA), enabling export orders from the United States and Britain respectively, which soon followed. In 1972, an improved version of the rotorcraft with more powerful engines, the Bo 105C, was developed; this model quickly superseded the Bo 105A. On 25 September 1973, the prototype Bo 106 performed its first flight; the Bo 106 shared many similarities to the Bo 105, the principal difference being a widened cabin area, capable of seating three abreast in the front row and four abreast in the rear of the cabin. However, nothing further came of the Bo 106 project.