宇宙ステーション補給機
Since the late 1980s National Space Development Agency of Japan (NASDA) has developed the HOPE-X small crewed winged spaceplane that would be launched by an H-IIA rocket. Despite having successfully flown sub-scale test prototypes, the project was cancelled in 2003 in favor of participation in the International Space Station with the "Kibō" Japanese Experiment Module and H-II Transfer Vehicle cargo spacecraft.