1990年NASA原计划进行9次航天飞机飞行,但实际仅进行了6次。在最近公布的飞行清单中,NASA已将原定1991～1993年33次飞行中的6次推迟。同期内一次性运载器的发射次数也从原定的16次降至13次。根据这一清单,航天飞机1991年将进行7次飞行(原定8次);1992年飞行8次(原定12次);1993年飞行12次(原计划为13次)。 目前正在建造的奋进号航天飞机将于1992年5月进行首次 In 1990, NASA originally planned 9 space shuttle flights, but it actually took only 6 flights. In the recently announced flight list, NASA has postponed six of the 33 flights scheduled for 1991-1993. During the same period, the number of launches of disposable carriers dropped from 16 to 13. According to this list, the space shuttle will fly seven times in 1991 (originally scheduled eight times); in 1992 it flew eight times (originally scheduled 12 times); and in 1993 it flew 12 times (originally planned 13 times). The space shuttle Endeavor currently under construction will be carried out for the first time in May 1992