Enlarge / SpaceX's Starship rocket lost control a few minutes after launch from South Texas on April 20. (credit: Jonathan Newton/The Washington Post via Getty Images) The Federal Aviation Administration is now reviewing a mishap investigation report submitted by SpaceX regarding the company's April test flight of its giant Starship rocket, a spokesperson for the regulatory agency said Tuesday. The milestone is noteworthy because it signals SpaceX has completed its investigation into the Starship test launch on April 20, which ended about four minutes after liftoff following engine failures and other problems during ascent.