With almost 1,700 built in a production run lasting two decades, civilian-owned Beavers continue plying their trade in over 50 countries all around the world. A turbine conversion, the Turbo Beaver (DHC-2 Mk.III) first flew in December 1963. This version featured a Pratt & Whitney PT6 A-6 turboprop, which offered lower empty and higher takeoff weights, and even better STOL performance. The Turbo Beaver's cabin was also longer, allowing maximum accommodation for 11, including the pilot. Externally, the Turbo Beaver had a much longer and reprofiled nose, and squared off, vertical tail. DHC also offered conversion kits enabling piston-powered Beavers to be upgraded to Turbo standard. Other conversions have been performed by a number of companies, including Kenmore Aviation and Viking Air.