Built for Hawaiian Airlines in 1953 but instead it was retained by Convair for prototype conversion to Allison turboprop. It flew as a test bed with a USAF serial number until 1960 when it was acquired by the FAA as N454. It then flew for a succession of non-airline operators until acquired by Kelowna Flightcraft in 1981. At some point it was upgraded to comply with the PacAero Engineering designed STC used on all subsequent CV-580 aircraft.