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It got NASA flying again, in 1988 and 2005, following the Challenger and Columbia disasters. And it flew 13 times to the space station, more than any other craft. On its last trip, it delivered a new storage compartment packed with supplies and a humanoid robot.

“You’re sad to see her be retired, but at the same time, it’s really a pride thing. We got her back OK. It was a beautiful mission,” said Ken Smith, a Boeing propulsion manager who monitored the shuttle’s systems from the landing strip.

But he added: “We’ve got two more to fly.”