This mission was the product of NASA's Commercial Crew program, a partnership between the space agency and two private companies (Boeing is the other) to build spaceships that can ferry astronauts to and from the International Space Station.

NASA astronauts Bob Behnken and Doug Hurley safely arrived at the space station on Sunday morning.

"It's been a real honor to be a super-small part of this nine-year endeavor, since the last time a United States spaceship has docked with the International Space Station," Hurley said shortly after docking.