Endeavour is still scheduled to launch early Sunday morning, at 4:39 AM Eastern Standard Time (0939 UTC). This mission will add a large crew module called Tranquility. It has a turret-like cupola with a spectacular view of Earth.
The Rotating Service Structure was removed at 8:39 AM Eastern on Saturday. Tanking begins at 7 PM Eastern, and will be covered on NASA TV. Live commentary on NASA TV and the Launch Blog begins at 11:30 PM Eastern.
Weather shows only a 20 per cent chance of violating launch constraints.