SpaceX made history at the end of May when it launched NASA astronauts Doug Hurley and Bob Behnken toward the ISS on the SpaceX Demo-2 test flight mission - the first time astronauts blasted off from American soil since the end of the space shuttle program nearly a decade ago.
The SpaceX Crew-2 flight will be her first trip to the International Space Station.
The astronauts can't land until at least two out of seven planned landing sites have good weather conditions, though their Crew Dragon ship is created to stay at the ISS for another two months.
SpaceX's first mission with people, called Demo-2, may have to last longer than planned as a potential tropical storm threatens to make conditions unsafe for an ocean landing.
NASA astronaut Shane Kimbrough will fly for his third trip to orbit after having previously flown aboard space shuttle Endeavour for STS-126 and aboard a Russian Soyuz spacecraft for Expedition 49/50 in 2016.
NASA is overseeing SpaceX's experimental mission, called Demo-2, and on Wednesday gave the company a "go" to proceed with its landing plans.
A brewing storm in the Caribbean Islands could leave them in orbit a while longer.
"We can not wait to get Bob Behnken and Doug Hurley back to Earth".
NASA announced on Tuesday the astronauts who will fly aboard the SpaceX Crew-2 mission to the International Space Station next spring.
"You have to remember this is a test flight", NASA Administrator Jim Bridenstine said from Kennedy Space Center.
For the first time since 2011, astronauts launched from American soil are heading to the International Space Station. National Oceanic and Atmospheric Administration forecasters on Wednesday predicted the likely formation of Tropical Storm Isaias, blowing along a path projected to hit Florida.
Coverage will be streaming on NASA Television, with the astronauts landing in one of these locations: off the coasts of Pensacola, Tampa, Tallahassee, Panama City, Cape Canaveral, Daytona or Jacksonville, NASA said in the same statement. The outer-edge green shows a 5-10% chance of sustained tropical storm-force winds. NASA's criteria note that steep waves, rain, lightning, low clouds, winds stronger than about 10 miles per hour, and other inclement conditions can trigger a "no-go" decision.
NASA's commercial crew program manager, Steve Stich, said flight controllers will closely monitor the weather and, if necessary, keep the astronauts at the space station until conditions improve.
While docked to the ISS, though, Endeavour can share life support and last much longer. It sounds like that's going to become the new normal according to NASA, with the extra person meaning that the crew can "effectively double the amount of science that can be conducted in space". In theory, that gives SpaceX and NASA opportunities through most of September to safely get Behnken and Hurley back home.
Site highlights each day to your inbox. "The beauty of this vehicle is we can stay docked to the space station".
McArthur was joined by her NASA and global partners Crew-2 crewmates to train at the SpaceX facility utilizing the Crew Dragon simulator.