Booster 21

Production timeline

1. Launch28 SEP '26

   Flight 14 launched from Starbase Pad 2; B21 splashed down in Gulf with two engines out, then FTS-terminated.
2. Ready to Launch21 SEP '26

   Booster 21 rolled to launch pad for wet dress rehearsal and Flight 14 launch prep; Flight 14 postponed to September 28.
3. Ready to Launch21 SEP '26

   Booster 21 rolled from Mega Bay 1 to Pad B, Starbase; now awaiting stacking with Ship 41. 3 cryo tests and 1 static fire complete. Flight 14 NET Sept 28.
4. Static Fire28 AUG '26

   STATIC FIRE Starship Booster 21 performed what looked like a 14 second multi engine static fire test ahead of flight 14
5. Engine Install24 AUG '26

   B21 engine installation complete (all engines installed); now awaiting rollout to pad NET Aug 25 for Flight Test 14.
6. Cryo Proof21 JUL '26

   Following two partial tests in the previous days, Starship Booster 21 (flight 14) completed a full tanking cyro test, with the booster fully frosty
7. Stacking29 JUN '26

   Booster 21 forward section F:11 stacked atop aft A:25 on 28-29 Jun, completing the stack.
8. Stacking25 JUN '26

   Booster 21 forward section (F3:4) moved into Mega Bay 1 for stacking.
9. Stacking14 JUN '26

   Booster 21 undergoing stacking in Mega Bay 1 ahead of Flight Test 14 (with Ship 41).