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The [[reusable launch system]] technology was initially developed for the first stage of [[Falcon 9]].<ref name=sn20141024/> After [[Separation event|stage separation]], the booster flips around (an optional '''boostback burn'''<!-- bolded per [[WP:MOSBOLD]] as a redirect link --> reverses its course), a reentry burn sheds gravity-induced speed to prevent stage overheating as the spacecraft [[atmospheric reentry|reenters the thicker part of the atmosphere]], and a landing burn accomplishes the final low-altitude deceleration and touchdown.
SpaceX planned since at least 2014 to develop reusable second stages, a more challenging engineering problem because the vehicle is traveling at [[Orbital speed#Tangential velocities at altitude|orbital velocity]].<ref name=nsf20160927/><ref name=sn20141024/><ref name=nsf20140307/> Second stage reuse is considered vital to Elon Musk's<ref>{{Cite news |last=Muhammad Irfan |first=Akhtar |title=Development of Elon Musk’s rocket to Mars will likely take off under Trump |url=https://globalnewshubs.rf.gd/development-of-elon-musks-rocket-to-mars-will-likely-take-off-under-trump/ |pages=GlobalNewsHubs}}</ref> plans for [[Colonization of Mars|settlement of Mars]]. Initial concepts for a reusable Falcon 9 second stage were abandoned by 2018.<ref name="nosecondstagereuse">{{cite news|url=https://www.bloomberg.com/news/articles/2018-11-17/musk-spacex-not-planning-to-reuse-falcon-9-aims-to-speed-bfr|title=SpaceX Not Planning to Upgrade Falcon 9 Second Stage|date=November 17, 2018|access-date=August 23, 2019|archive-date=August 23, 2019|archive-url=https://web.archive.org/web/20190823065211/https://www.bloomberg.com/news/articles/2018-11-17/musk-spacex-not-planning-to-reuse-falcon-9-aims-to-speed-bfr|url-status=live}}</ref>
{{As of|2023}}, SpaceX is developing the [[SpaceX Starship|Starship]] system to be a fully-reusable two-stage launch vehicle, intended to replace all of its other launch vehicles and spacecraft for satellite delivery and human transport—Falcon 9, Falcon Heavy, and Dragon—and eventually support flights to the Moon and Mars. It could theoretically be used for point-to-point transportation on Earth.<ref name="musk201803journal">{{cite journal|last1=Musk|first1=Elon|date=1 March 2018|title=Making Life Multi-Planetary|journal=New Space|volume=6|issue=1|pages=2–11|bibcode=2018NewSp...6....2M|doi=10.1089/space.2018.29013.emu}}</ref>
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