BOSTON — Boeing executives said the company is making progress on containing the costs of its CST-100 Starliner commercial crew vehicle, but offered few details on technical work getting the spacecraft ready for its next flight.

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Jeff Foust writes about space policy, commercial space, and related topics for SpaceNews. He earned a Ph.D. in planetary sciences from the Massachusetts Institute of Technology and a bachelor’s degree with honors in geophysics and planetary science...