Quoted from CGTNWednesday (4/9), the operations plan released by the FAA indicated a four-hour launch would open at 3:33 a.m. from NASA’s Kennedy Space Center, with backup opportunities on Saturday and Sunday.
Organized by billionaire entrepreneur Jared Isaacman, the Polaris Dawn mission aims to reach a peak altitude of 1,400 kilometers, the highest altitude for any manned mission in more than half a century, dating back to NASA’s Apollo program.
The mission culminates in the first spacewalk by a crew of four entirely non-professional astronauts, who will wear SpaceX’s sleek, newly developed extravehicular activity suits.
The launch was delayed twice, initially due to technical issues with the launch tower and later due to weather conditions affecting the landing phase.
To further complicate matters, the separate SpaceX Falcon 9 mission lost its first-stage booster, which normally performs a precision upright landing on an unmanned craft.
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The incident led to a temporary halt, since the removal, of the productive launch vehicle that NASA and private companies rely heavily on to launch astronauts and satellites into orbit. 
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