May 5th - on this day in 2021, SpaceX conducted a high-altitude test flight with the Starship SN15 prototype vehicle. Launching from Suborbital Pad A at Boca Chica, Texas, the rocket reached an altitude of 10 km. It then successfully conducted the bellyflop maneuver, followed by the flip and landing burn, touching down on the nearby landing pad, despite one Raptor engine failing on ascent. | NASASpaceflight.com