SpaceX stacks Ship 28 on Booster 10 as the company prepares for Starship's third integrated flight test. The stack is likely preparing for a test campaign, which might involve a WDR as part of the test sequence.

So far, the stack has not performed joined testing.

Booster 10:
The Booster already features 33 Raptors. Booster 10 is the first stage for the third flight of Starship. The Booster previously was static fired once and performed 4 cryogenic pressure tests.
Learn More: https://nextspaceflight.com/starship/...

Ship 28:
Ship 28 is a Starship upper-stage prototype planned to launch on the third Starship flight test.
Learn More: https://nextspaceflight.com/starship/...

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