List fan Amerikaanske X-fleanmasines
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

Feriene Steaten
 
Fleanmasine