<page_title> List of X-15 flights </page_title> <section_title> List of flights </section_title> <table> <cell> 188 <col_header>  </col_header> <col_header> FF </col_header> </cell> <cell> Knight <col_header>  </col_header> <col_header> Pilot </col_header> </cell> <cell> 6.70 <col_header>  </col_header> <col_header> MM </col_header> </cell> <cell> 4,520 <col_header>  </col_header> <col_header> MV </col_header> </cell> <cell> Highest Mach and speed records of program. The X-15A-2's last free flight. Craft retired after setting records. <col_header>  </col_header> <col_header> Notes </col_header> </cell> </table>
William Knight set the X-15 flights's Mach (6.70) and speed (4,520 mph) records on its 188th free flight.