What historical comparison is mentioned regarding alternative return vehicles if the Starliner remains grounded?

Answer

Potentially transferring to a waiting Soyuz or Crew Dragon capsule

The presence of the crew on the ISS allows for redundancy, meaning they could potentially transfer to a waiting Soyuz or Crew Dragon capsule for the return trip if the Starliner remains unfit to fly.

What historical comparison is mentioned regarding alternative return vehicles if the Starliner remains grounded?

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