The first all-private astronaut team ever flown aboard the International Space Station (ISS) safely splashed down in the Atlantic off Florida's coast on Monday, concluding a two-week science mission hailed as a landmark in commercialized human spaceflight.

The SpaceX crew capsule carrying the four-man team, led by a retired NASA astronaut who is now vice president of the Texas company behind the mission, Axiom Space, parachuted into the sea after a 16-hour descent from orbit.

The splashdown capped the latest, and most ambitious, in a recent series of rocket-powered expeditions bankrolled by private investment capital and wealthy passengers rather than taxpayer dollars six decades after the dawn of the space age.