One of Boeing Co’s CST-100 Starliner astronaut capsules is seen at a production facility in Cape Canaveral, Florida [File: Eric M Johnson/Reuters]

NASA has warned SpaceX and Boeing Co of design and safety concerns for their competing astronaut launch systems, according to industry sources and a new government report, threatening the US bid to revive its human spaceflight programme later this year.

NASA is paying SpaceX $2.6bn and Boeing $4.2bn to build rocket

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