Unsuccessful experimental and prototype fighters assigned numbers in the teen range (13–19) are generally not considered part of the series. Thus it does not include the Northrop YF-17, which later evolved into the F/A-18. The designations F-13 and F-19 were not assigned.
^"Heat Vision: US Teen Series Fighters Getting IRST". Defense Industry Daily. Retrieved 30 August 2013. Programs are underway to give some American "teen series" fighters this capability, albeit in a somewhat unusual way…
^Carlo Kopp (April 1991). "The Advanced Tactical Fighter [YF-22 and YF-23]". Australian Aviation. 1991 (April). Originally published Australian Aviation, April/May, 1991. Retrieved 30 August 2013. Unlike earlier designs, the ATF is a careful blend of advanced aerodynamics, propulsion and electronics and involves a degree of system integration never before attempted in a tactical aircraft. The reason for this unprecedented effort is quite clear - the Russians have finally deployed their equivalent to the teen series fighters (see May, June 1990 AA), the Flanker and Fulcrum, and have thus very rapidly closed the technological gap which offered such favourable exchange rates for so long.
^Kopp, Carlo (13 May 2011). "Lockheed-Martin / Boeing F-22 Raptor". Ausairpower.net. p. 1. Retrieved 14 May 2011. The Sukhoi and MiG fighters were designed around the aerodynamic, propulsion and tactical ideas which were central to the US teen-series F-14, F-15, F-16 and F/A-18A fighters: highly agile 'energy fighters' capable...
Bibliography
Spick, Mike, ed. The Great Book of Modern Warplanes. St. Paul Minnesota: MBI, 2000. ISBN0-7603-0893-4.