A rare photo of the world's only USAC Turbo Express, undergoing conversion to the Basler BT-67 prototype in the Basler hangar (ex N300TX). The original rectangular windows indicate that this aircraft was still largely in Turbo Express configuration at the time of this photo. The following year they were replaced by smaller round porthole windows, then later reverted to rectangular windows again.

Company demo airplane (and BT-67 prototype) at the Basler Turbo Conversions facility.

Basler BT-67 development aircraft. Still with the unusual round windows, which were later replaced by the regular rectangular ones.