Claim: Cessna Citation I is a small corporate jet powered by two Pratt & Whitney Canada JT15D-1 turbofan engines that was manufactured by Cessna from 1971-1985 and  first flew on September 15, 1969
Evidence: Corporate jet The Cessna 500 Citation I is a small business jet announced by Cessna in October 1968 and is the basis of the Citation family. The aircraft was powered by two Pratt & Whitney Canada JT15D-1 turbofan engines after Cessna's experience with the T-37 Tweet twinjet trainer. The Fanjet 500 prototype first flew on September 15, 1969. 1971-1985