Boeing and launch partner United Launch Alliance (ULA) completed a key step today in pursuit of launching U.S. astronauts aboard their commercial spacecraft. The Boeing CST-100 Starliner crew capsule was atop the ULA Atlas V rocket at Cape Canaveral Air Force Station’s Launch Complext 41 in Florida, with the rocket fully fuelled while the combined crew all took part in a dress rehearsal called the “integrated Day of Launch Test – aka IDOLT because space people all love acronyms so much. The rehearsal paves the way for the uncrewed Orbital Flight Test (OFT) that NASA, ULA and Boeing are targeting for December 20 (which just changed today from December 19), which will be exactly what the first crewed mission aboard the Starliner will be, but without the crew on board.