09/30/2007. Remarks by Jack McKillop: "This was the prototype of the CL-44 series and the first of 12 Yukons built fro the Royal Canadian Air Force (RCAF). It made its first flight on November 15, 1959 and was delivered to the RCAF on May 5, 1962 with serial number 15501 and was assigned to No. 412 (Transport) Squadron based at RCAF Station Uplands, Ontario; on June 7, 1962, the serial number was changed to 15921.

The RCAF was merged into the Canadian Armed Forces on February 1, 1968 and the serial number was again changed to 106921 on May 26, 1970. The surviving Yukons were retired in 1971 in favor of a smaller number of Boeing 707-320s designated CC-137 in CAF service.

This Yukon was sold to the Canadian company Beaver Enterprises on November 18, 1971 and registered CF-DSY. It was later leased to the El Salvadorian airline TACA International Airlines from July to October 1974 and registered YS-04C. In November 1974, Beaver Enterprises sold it to the Columbian airline Aerocondor (Aerovias Condor de Colombia) who registered it HK-1972.

On February 22, 1975, this aircraft took off from Medellín-Enrique Olaya Herrera Airport, Colombia, and struck a 15 m (49 ft) high pine tree with its right wing tip. Control was lost and the aircraft crashed into a mountain 3,937 ft (1,200 m) further on. All five aboard were killed and the aircraft was written off."