Boeing’s CST-100 Starliner has separated from the Atlas V Centaur and is flying on its own, embarking on its inaugural flight to the International Space Station. The Atlas Centaur will fall back to Earth and impact the ocean near Australia. After a series of orbital adjustments, Starliner will be on course for rendezvous and docking with the space station at 5 a.m. on Saturday, Dec. 21.