Originally delivered to the US Forest Service in June 1964 as N146Z. Converted to BT-67 in May 1991 (conversion #7) and re-delivered to the USFS as N115Z. Registration changed to N115U in April 2016, and sold to Basler in Dcember 2020. Seen here being readied for re-sale. Delivered to Desert Air on 10 April 2022, still as N115U.