List fan Amerikaanske eksperimintele fleanmasines.

• Bell X-1
• Bell X-2 Starbuster
• 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
• Curtiss-Wright X-19
• X-20 Dyna-Soar
• Northrop X-21
• Bell X-22
• Martin-Marietta X-23 PRIME
• Martin-Marietta X-24
• Bensen X-25
• X-26 Frigate
• Lockheed X-27
• Pereira X-28 Sea Skimmer
• Grumman X-29
• Rockwell X-30
• Rockwell-MBB X-31
• Boeing X-32
• Lockheed Martin X-33 VentureStar
• Orbital Sciences X-34
• Lockheed Martin X-35
• McDonnell Douglas X-36
• Boeing X-37
• NASA X-38
• X-39
• Boeing X-40
• X-41 Common Aero Vehicle
• X-42 Pop-Up Upper Stage
• Boeing X-43 Hyper-X
• X-44 MANTA
• Boeing X-45
• Boeing X-46
• X-47 Pegasus
• Boeing X-48
• Sikorsky Piasecki X-49
• Boeing X-50 Dragonfly
• Boeing X-51
• X-53 Active Aeroelastic Wing (AAW) flight demonstrator