Similar to X-2_(航空機・アメリカ)

Bell X-16

Douglas X-3 Stiletto

Ryan X-13 Vertijet

Lockheed X-17

Curtiss-Wright X-19

Northrop X-21

Douglas A-3 Skywarrior

Arado Ar 232 Tausendfüßler

Curtiss-Wright AT-9 Jeep

Azon

Consolidated B-32 Dominator

Consolidated B-24 Liberator

Boeing B-29 Superfortress

Northrop YB-35

Convair B-58 Hustler

North American XB-70 Valkyrie

Parasite aircraft

Air-launch-to-orbit

Airborne aircraft carrier

Airborne Launch Assist Space Access

Lockheed D-21

Curtiss F9C Sparrowhawk

Fieseler Fi 157

FICON project

Henschel Hs 293

MAKS (spacecraft)