The X-33, X-34, X-37, X-40A, X-42 are
suitable to group with the following collection series.
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International RLV
Avatar RLV
Boeing X-37
Boeing X-40A
Canadian Arrow
Dassault Hermes
Kistler Aerospace K-1
Lockheed X-33A
McDonnell-Douglas DC-X
NPO Energia Kliper
Orbital Sciences X-34
Orbital Sciences X-42 Pop-up Upper
stage
PlanetSpace Silver Dart
Scale-Composites X-38 CRV
Spaceship Co. Space Ship One
Spaceship Co. Space Ship Two
XCOR Areospace Lynx Reocketplane
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U.S. Experimantal aircraft
"X-Planes"
Bell X-1
Bell X-2
Douglas X-3 Stilletto
Northrop X-4 Bantam
Bell X-5
Convair X-6
Lockheed X-7
Aerojet General X-8 Aerobee
Bell X-9 Shrike
North Ameriacn X-10
Convair X-11 Atlas A
Convair X-12 Atlas B
Ryan X-13 Vertijet
Bell X-14
Northrop American X-15
Bell X-16 Bald Eagle
Lockheed X-17
Hiller X-18
Curtiss-Wright X-19
Boeing X-20 Dyna-Soar
Northrop X-21A
Bell X-22A
Martin Mariette X-23A PRIME
Martin Mariette X-24A/B
Bensen X-25
Schweizer X-26A / Lockheed X-26B
Q-Star
Lockheed X-27 Lancer
Pereira X-28A Osprey
Grumman X-29A
Boeing X-30A
Rockwell International / MBB X-31A
Boeing X-32A
Lockheed X-33A
Orbital Sciences X-34
Lockheed Martin X-35A
Boeing X-36
Boeing X-37
Scale-Composites X-38 CRV
X-39 (unknown)
Boeing X-40A
Boeing X-41 CAV
Orbital Sciences X-42 Pop-up Upper
stage
Micro Craft X-43A Hyper-X
Lockheed Martin / NASA X-44 Manta
Boeing X-45A UAV
Boeing X-46
Northrop Grumman X-47 Pegasus
Boeing / NASA X-48
X-49 (unknown)
Boeing / DARPA X-50 Dragonfly
Boeing X-51A
X-52 (unknown)
NASA X-53 AAW |