The liftoff time slipped from Saturday to Sunday evening due to forecasts of gusty, onshore winds over Florida - remnants of Tropical Storm Eta - that would have made a return landing for the Falcon 9 rocket's reusable booster stage hard, NASA officials said. He went on to question the rate of false positives for PCR tests - seeming to predict his own skepticism if and when the PCR test result comes back positive.
The timing of the tests appears to be linked to a SpaceX launch at which Musk was likely hoping to meet with the four astronauts involved, as he did with Robert Behnken and Douglas Hurley before the successful launch in May, as the New York Times reports.
Musk said his first tests were rapid tests, and he was awaiting the results of lab tests.
Whether Musk came into contact with the astronauts was unclear, but unlikely since the crew has been in routine quarantine for weeks prior to their flight on Saturday. The 15-minute rapid tests are less sensitive than the lab tests, which take hours longer to process.
The fourth crew member is Japanese astronaut Soichi Noguchi, making his third trip to orbit after flying on the US space shuttle in 2005 and a Russian Soyuz spacecraft in 2009.More news: NASA certifies SpaceX to fly for astronauts on its crew Dragon spacecraft
He was inside Kennedy's Launch Control last May for SpaceX's first astronaut flight last May.
'The next era in human spaceflight' © NASA NASA astronauts Bob Behnken and Doug Hurley.
Nasa and SpaceX representatives wouldn't say where Musk was Friday, although officials confirmed he was not at Kennedy.
"Knowing Elon the way I do, they will figure out a way for him to be very much connected", Hurley told The Associated Press from Houston.
Four astronauts - three Americans and one Japanese - are scheduled to rocket to the International Space Station on Saturday night.
SpaceX shared a tweet shortly after the release saying they 'will continue monitoring weather conditions for liftoff and along the flight path'.More news: "Something Bogus Going On": Elon Musk On Results After 4 Covid Tests
The latest launch was bumped a day in order to give SpaceX's booster-landing platform enough time to get into position in the Atlantic, given the rough seas in the wake of Tropical Storm Eta.
NASA officials only just signed off on Crew Dragon's final design earlier this week, capping a almost 10-year development phase for SpaceX under the space agency's public-private crew program.
We're ready for this launch, we're ready for our six months of work that is waiting for us on board the International Space Station, and we're ready for the return.
NASA turned over space station ferry trips to SpaceX and Boeing, which has yet to launch anyone, following the retirement of the shuttle fleet in 2011.
The crew for the flight to the International Space Station includes three American astronauts - Victor Glover, Shannon Walker and the mission commander, Mike Hopkins, a U.S. Air Force colonel who is to be sworn into the fledgling U.S. Space Force once aboard the orbiting laboratory.More news: Suu Kyi's party wins absolute majority in Myanmar polls