Booster 19

First Block 3 Super Heavy booster to fly with various enhancements including Raptor 3 engines, integrated interstage and 3 grid fins instead of 4 used. Used on the 12th Starship flight test, replacing Booster 18 written off during ground testing in November 2025. It was lost after stage separation, having completed an off-nominal boostback burn with fewer engines than planned.