![](https://i0.wp.com/lf5422.com/wp-content/uploads/2019/10/XF-103.jpg?fit=594%2C314&ssl=1)
![](http://localhost:8888/lf_temp/wp-content/uploads/2019/10/9d2e7-screenshot-2019-10-08-at-15.30.34.jpg?w=1024&h=728)
F-109 Bell D-188A (unofficial military designations XF-109/XF3L)
![](http://localhost:8888/lf_temp/wp-content/uploads/2019/10/294f2-f-109.jpg?w=1024&h=694)
F-110 Phantom ( F-110 Spectre, the original name of the McDonnell Douglas F-4 Phantom II aircraft )
![](http://localhost:8888/lf_temp/wp-content/uploads/2019/10/b991a-f-117.jpg?w=1024&h=612)
Note: Designations YF-110, YF-112 through YF-116, and YF-118 were captured foreign aircraft used for evaluation and aggressor training. They were given designations in sequence—based on chronology—with “black” project aircraft, continuing the pre-1962 F series.[15][16]
- YF-110 MiG-21s – Mikoyan-Gurevich
- YF-112 Su-22 – Sukhoi
- YF-113 MiG-23s – Mikoyan-Gurevich
- YF-113G – possible USAF “black project”[15]
- YF-114 MiG-17 – Mikoyan-Gurevich
- YF-115 – Rumored designation of captured Su-7
- YF-116 – Rumored designation of captured MiG-25
- F-117D Tacit Blue – Northrop
- YF-118 – Rumored designation of MiG-29
- YF-121 – Rumored “black project”[15]
![](http://localhost:8888/lf_temp/wp-content/uploads/2019/10/5db93-tacit-blue.jpg)