B19

Booster 19 (B19) is the second Super Heavy Block 3 built by SpaceX. It was assembled in a hurry to replace B18 after the anomaly it suffered during tests at Massey. Its assembly began in November 2025 in Mega Bay 1 and ended on 23 December, after only 26 days of work. After four cryogenic tests in February 2026, B19 gradually received its 33 Raptor 3 engines and began its engine test campaign in March. A first 10-engine firing was aborted on 16 March due to an issue with the Pad 2 flame deflector sensors. Two 33-engine tests followed in April and May, including a successful full-duration firing on 7 May 2026. Paired with Ship 39, B19 flew on Flight 12, launched on 22 May 2026 from Starbase. It was the very first flight of a Block 3 Starship: it completed ascent and hot staging but suffered failures during the boostback burn and crashed at sea 300 km from the planned area.