 The "Review of United States Human Space Flight Plans" was to examine ongoing and planned National Aeronautics and Space Administration (NASA) development activities, as well as potential alternatives and present options for advancing a safe, innovative, affordable, and sustainable human space flight program in the years following Space Shuttle retirement.The panel worked closely with NASA and sought input from the United States Congress, the White House, the public, industry, and international partners as it developed its options.It presented its results on October 22, 2009.