WAvangard (hypersonic glide vehicle)
WAyaks
WBoost-glide
WDARPA Falcon Project
WHGV-202F
WHypersonic Technology Demonstrator Vehicle
WStratolaunch Systems
WHypersonic Technology Vehicle 2
WIntermediate eXperimental Vehicle
WKholod
WLockheed L-301
WLockheed Martin SR-72
WMikoyan-Gurevich MiG-105
WNASA X-43
WReaction Engines A2
WSharp Edge Flight Experiment
WSkylon (spacecraft)
WStratolaunch Systems
WTupolev Tu-130
WWaverider
WNorth American X-15
WBoeing X-51 Waverider