美国航宇局计划用航天飞机把44个商用有效载荷送入轨道。航天飞机停飞使航宇局不得不修改计划,取消了一些私人经营的有效载荷,放弃了新的有潜力的商用航天飞机。因为到1992年底用航天飞机运送的商用有效载荷只有15个。主管部门于1986年下半年开始考虑了有效载荷的优先权。但结果又被迫从总清单中取消了29个商用有效载荷,剩下的 NASA plans to use space shuttle to put 44 commercial payload into orbit. The suspension of the space shuttle enabled NASA to modify its plan, cancel some privately-run payloads and relinquish new potential commercial spacecraft. Because only 15 commercial payloads are being delivered by space shuttle by the end of 1992. Competent authorities began considering the payload priority in the second half of 1986. But the result was again forced to remove 29 commercial payloads from the master list and the rest