Boeing's first uncrewed test flight of its Starliner spacecraft for astronauts is now set for no earlier than Dec. 20, one day later than planned, due to a SpaceX launch delay earlier this week. The United Launch Alliance (ULA) announced the 24-hour slip for Starliner today (Dec. 6) after successfully completing a critical "wet-dress" rehearsal for Boeing's upcoming test flight on an Atlas V rocket.