NASA knew Boeing Starliner had leak before launch but believed it too small to pose threat, leaving astronauts stuck at ISS: reports New York Post Nasa overlooked minor leak in Boeing starliner pre-launch, leaving astronauts stranded at ISS: Report The Times of IndiaWhy former NASA astronaut says Starliner’s delayed return is good for crew CNNThe 'sticky valve' on Boeing's rocket ship that left astronauts stuck in space The TelegraphBoeing's Starliner: A Cautionary Investor's Tale Forbes