Originally built as C-47s between 1943 and 1945, these aircraft were later converted to BT-67s by Basler Turbo Conversions in Oshkosh, Wisconsin, between 1998 and 2004. The extensive ...

The Basler BT-67 aircraft being used for the survey, which looks similar to a DC3 or Dakota aircraft, has two propeller engines and "a strong track record of reliability", Bell Geospace said.