Boeing Co's new Starliner astronaut capsule was poised for a Monday night launch of its long-delayed inaugural crewed test flight to the International Space Station, two years after its first voyage without humans to the orbital laboratory. The gumdrop-shaped CST-100 Starliner with two astronauts aboard was due for liftoff at 10:34 p.m. (0234 GMT on Tuesday) from NASA's Kennedy Space Center in Florida, carried atop an Atlas V rocket furnished by the Boeing-Lockheed Martin joint venture United Launch Alliance (ULA).