费用因素正促使日本科技厅考虑在1999年希望号的技术验证飞行器希望X发射之后不再另外研制一架这种飞行器。由于日本宇宙开发事业团正在把精力放在H－2火箭的商业活动上，它发射不载入希望号小型航天飞机的职责似乎不那么令人关注了。实际上，22吨重的希望号是H－2火箭一个重要 The cost factor is causing the Japanese Agency for Science and Technology to consider eliminating the need to develop another such aircraft after the 1999 Provisional Technology Verification aircraft wanted the X to be launched. As JAXA is focusing on the commercial activities of the H-2 rocket, it seems less aroused its responsibility to launch a mission not loaded on the Hopes small shuttle. In fact, the 22-ton hope symbol is an important H-2 rocket