 these chronological lists include all crewed spaceflights that reached an altitude of at least 100&nbsp;km (the fai&nbsp;definition of spaceflight, see kÃ¡rmÃ¡n line), or were launched with that intention but failed. the usa has adopted a slightly different definition of spaceflight, requiring an altitude of only . during the 1960s, 13 flights of the us x-15 rocket plane&nbsp;met the us criteria, but only two met the fai's. these lists include only the latter two flights; see the list of highest x-15 flights&nbsp;for all 13. , there have been 301 manned spaceflights that reached 100&nbsp;km or more in altitude (303 including two failed attempts), 8 of which were sub-orbital spaceflights. ==summary==  {| class="wikitable" style="text-align:right;" |- |width="65"| ||width="120"| / ussr||width="120"|||width="65"|||width="65"|total |- |1961â1970||16||25||||41 |- |1971â1980||30||8||||38 |- |1981â1990||24||37||||61 |- |1991â2000||20||63||||83 |- |2001â2010||24||34||3 ||61 |- |2011â2020||16||3 ||2 ||19 |- |align="center"|total||130||170||5||305 |} these figures include the two unsuccessful launches sts-51-l and soyuz t-10-1. ==detailed lists== the salyut series, skylab, mir, iss, and tiangong-1 space stations, with which various of these flights docked in orbit, are not listed separately here. see the detailed lists (links above) for information. missions which were intended to reach space but which failed to do are listed in italics. {| class="wikitable" |- valign="top" |1961 |vostok 1 â mercury-redstone 3 â mercury-redstone 4 â vostok 2 |- valign="top" |1962 |mercury-atlas 6 â mercury-atlas 7 â vostok 3 â vostok 4 â mercury-atlas 8 |- valign="top" |1963 |mercury-atlas 9 â vostok 5 â vostok 6 â x-15 flight 90 â x-15 flight 91 |- valign="top" |1964 |voskhod 1 |- valign="top" |1965 |[[vosk
Human_spaceflight Lists_of_space_missions Spaceflight_timelines