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| Bell X-1 | ![]() |
Bell X-2 | ![]() |
| Douglas X-3 Stiletto | ![]() |
Northrop X-4 Bantam | ![]() |
| Bell X-5 | ![]() |
Convair X-6 | ![]() |
| Lockheed X-7 | ![]() |
Aerojet General X-8 | ![]() |
| Bell X-9 Shrike | ![]() |
North American X-10 | ![]() |
| Convair X-11 | ![]() |
Convair X-12 | ![]() |
| Ryan X-13 Vertijet | ![]() |
Bell X-14 | ![]() |
| North American X-15 | ![]() |
Bell X-16 | ![]() |
| Lockheed X-17 | ![]() |
Hiller X-18 | ![]() |
| Curtis-Wright X-19 | ![]() |
Boeing X-20 Dyna Soar | ![]() |
| Northrop X-21 | ![]() |
Bell Textron X-22 | ![]() |
| Martin Marietta X-23 | ![]() |
Martin Marietta X-24A | ![]() |
| Martin Marietta X-24B | ![]() |
Martin Marietta X-24C | ![]() |
| Bensen X-25 Gyrocopter | ![]() |
Lockheed, Schweitzer X-26A | ![]() |
| Lockheed, Schweitzer X-26B | ![]() |
Lockheed X-27 Lancer | ![]() |
| Pereira X-28 Osprey I | ![]() |
Grumman X-29 | ![]() |
| National Aero-Space X-30 | ![]() |
Rockwell, MBB X-31 | ![]() |
| Boeing X-32 | ![]() |
Lockheed Martin X-33 | ![]() |
| Orbital Sciences X-34 | ![]() |
Lockheed Martin X-35 | ![]() |
| McDonnell Douglas X-36 | ![]() |
Boeing X-37 | ![]() |
| Scaled Composites X-38 | ![]() |
US Air Force Research Laboratory X-39 Future Aircraft Technology Enhancements (FATE) |
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| Boeing X-40 | ![]() |
??? X-41 Common Aero Vehicle (CAV) |
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| ??? X-42 Pop-Up Upper Stage |
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Microcraft, GASL X-43 Hyper-X |
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| Lockheed Martin X-44 Manta | ![]() |
Boeing X-45 Unmanned Combat Air Vehicle (UCAV) |
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| Boeing X-46 Unmanned Combat Aerial Vehicle (UCAV) |
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Northrop Grumman X-47 Pegasus Unmanned Combat Aerial Vehicle (UCAV) |
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| Northrop Grumman X-48 Blended Wing Body (BWB) |
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??? X-49 | ![]() |
| Boeing X-50 Dragonfly Canard Rotor Wing (CRW) |
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??? X-51 | ![]() |