Q&A with John Elbon, VP and general manager of Boeing’s space exploration division

The Centaur upper stage destined to send Boeing’s CST-100 Starliner crew capsule into orbit on its first unpiloted test flight next year has arrived at Cape Canaveral after a sea journey aboard United Launch Alliance’s Mariner transport ship.

Just three weeks after the Delta 4-Heavy rocket left the launch pad on its way to a successful satellite-deployment mission for U.S. national security, a smaller booster in the family has rolled out for its August military flight.

Three fresh crew members lifted off at 1541 GMT (11:41 a.m. EDT) Friday on a six-hour trip to the International Space Station, riding a Soyuz spaceship from the Baikonur Cosmodrome in Kazakhstan. The trio hails from Russia, the United States and Italy and boosted the station’s crew back to a full complement of six. Docking occurred at 2154 GMT (5:54 p.m. EDT).