The operating idea
Recovery became part of the launch business.
Falcon 9’s first stage carries the nine Merlin engines and most of the vehicle’s propulsion hardware. Bringing it back lets the same major component fly again, and the flight record now runs to 36 missions on a single stage.
Recovering an orbital-class stage spans guidance, propulsion, aerodynamics, structures and ground operations. The booster separates at high speed, shapes its return through the atmosphere, survives re-entry heating, steers to a narrow target and removes almost all of its vertical speed in the final seconds.
The first landing on land came in December 2015, the first droneship landing in April 2016, and the first reflight of a flown stage in March 2017. Each first became a procedure, and the procedures became a fleet.
