Astronauts arrive at space station aboard Endeavour

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Four astronauts got a hearty welcome from crew members aboard the International Space Station after they arrived Saturday morning.

They were the first crew to be propelled into orbit by a rocket booster that was recycled from a spaceflight only five months earlier – a strategy by SpaceX aimed at making flights more economical.

The SpaceX Endeavour carrying them docked to the space station early Saturday above the Indian Ocean. It marked the second “operational” space station team launched by NASA since human spaceflights resumed from U.S. soil last year after a nine-year hiatus.

First to enter the space station was Japanese astronaut Akihiko Hoshida followed by France’s Thomas Pesquet and two NASA astronauts, Megan McArthur and mission commander Shane Kimbrough bringing up the rear.

NASA has been operating these flights under its new partnership with SpaceX, the rocket company founded by billionaire entrepreneur, Elon Musk.