Falcon 9 Full Thrust first-stage booster

The Falcon 9 Full Thrust first-stage booster family comprises SpaceX's individually serialized reusable cores flown before the Block 5 production standard. Each one-stage booster used nine Merlin 1D engines and could perform controlled entry and landing burns; the fleet achieved the first orbital-class booster landing and first orbital-class booster reflight before its final missions in 2018.