A paraplegic engineer has become the first wheelchair user in space, blasting off with Blue Origin.

CAPE CANAVERAL, Fla. – With the weather looking up, SpaceX and NASA officials vowed Tuesday to keep crew safety the top priority for the nation's first astronaut launch to orbit in nearly a decade. Veteran NASA astronauts Doug Hurley and Bob Behnken were set to make history Wednesday afternoon, riding SpaceX's Falcon 9 rocket and Dragon capsule to the International Space Station on a test flight. SpaceX has been launching cargo capsules to the space station since 2012. NASA hired SpaceX and Boeing in 2014 to transport astronauts to the space station, after commercial cargo shipments had taken off. Development of SpaceX’s Dragon and Boeing’s Starliner capsules took longer than expected, however, and the U.S. has been paying Russia to launch NASA astronauts in the interim.

Veteran NASA astronauts Doug Hurley and Bob Behnken were set to make history Wednesday afternoon, riding SpaceX's Falcon 9 rocket and Dragon capsule to the International Space Station on a test flight. On the eve of the launch, NASA Administrator Jim Bridenstine said from Kennedy Space Center that both the space agency and SpaceX have been diligent about making sure everyone in the launch loop knows they're free to halt the countdown if there's a concern. SpaceX has been launching cargo capsules to the space station since 2012. NASA hired SpaceX and Boeing in 2014 to transport astronauts to the space station, after commercial cargo shipments had taken off. Development of SpaceX's Dragon and Boeing's Starliner capsules took longer than expected, however, and the U.S. has been paying Russia to launch NASA astronauts in the interim.

(AP Photo/David J. Phillip)CAPE CANAVERAL, Fla. Stormy weather is threatening to delay SpaceXs first astronaut launch. It will be the first time astronauts launch from Florida in nine years and a first for a private company. We're continuing to be vigilant and careful and make sure we do this right.Forecasters put the odds of acceptable launch weather at 40%. Hans Koenigsmann, a vice president for SpaceX, said the launch control team will incorporate global weather patterns and models to determine whether it's safe to launch. If the weather gods are working with us," he said, liftoff will occur at 4:33 p.m. SpaceX has a split-second launch window.