u00a0"A perfect launch, right on time," said a NASA spokesman after the shuttle reached orbit about eight minutes into its flight, hurtling at a speed of more than 15,000 miles (24,000 kilometers) per hour, NASA said.

Moment before the lift-off, launch director Mike Leinback wished the crew godspeed, declaring: "All the vehicle systems are outstanding today, the weather is near perfect for a good lif-toff today."

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Space agency officials said the mission was crucial as just five more shuttle launches remain before the planned September 2010 retirement of the fleet and the spare parts will add years to the space station's life. "

You'll see this theme in some of the flights that are going to come after ours as well," said mission director Brian Smith. "This flight is all about spares, basically, we're getting them up there while we still can."