The SN9 Starship performed a first flight similar to the one of SN8. It launched up to an altitude of 10 km or 33,000 ft, did a belly flop maneuver and a controlled descent to the landing pad where the landing flip maneuver was unsuccessful and resulted in the destruction of the prototype on impact.
Space Exploration Technologies Corp., known as SpaceX, is an American aerospace manufacturer and space transport services company headquartered in Hawthorne, California. It was founded in 2002 by entrepreneur Elon Musk with the goal of reducing space transportation costs and enabling the colonization of Mars. SpaceX has many pads, on the East Coast of the US they own SLC-40 at Cape Canaveral and LC-39A at the Kennedy Space Center for their lower inclination launches. They also own SLC-4E at Vandenberg, California for their high inclination launches. Another site is also being developed at Boca Chica, Texas.
SpaceX has received clearance to launch from the FAA and Boca Chica Village residents have been asked to evacuate. Launch is GO for today's window, but the T-0 is not known precisely.
The SpaceX Starship is a fully reusable super heavy-lift launch vehicle under development by SpaceX since 2012, as a self-funded private spaceflight project. The second stage of the Starship — is designed as a long-duration cargo and passenger-carrying spacecraft. It is expected to be initially used without any booster stage at all, as part of an extensive development program to prove out launch-and-landing and iterate on a variety of design details, particularly with respect to the vehicle's atmospheric reentry.