SpaceX has clinched yet another Falcon 9 landing. Early on Sunday, the private spaceflight company successfully put a Japanese communications satellite into orbit and, for the sixth time, clinched the landing of the first stage of its flagship rocket.

The event, which follows a failed attempt in June, marks the fourth time SpaceX has landed a vehicle at sea. In order to make the successful landing, the first stage of the rocket was subjected to “extreme velocities and re-entry heating.”

JCSAT-16, the commercial communications satellite that Falcon 9 was carrying, was put into a geostationary transfer orbit that takes it to a maximum altitude of over 22,000 miles over the Earth’s surface.

SpaceX successfully launched JCSAT-14 in May.

28893427371_4e2417b551_o An image showing the first stage of SpaceX's Falcon 9 rocket on a drone ship, Aug.14, 2016. Photo: SpaceX

Success in recovering rockets is crucial to the company’s space program, which seeks to drastically cut cost of travel by reusing the rockets. Currently, the first stage of a rocket is discarded after each use, making spaceflight — even a suborbital one — dauntingly expensive.

However, the company has still not reused any of its vehicles. In June, SpaceX CEO Elon Musk said that he plans to re-launch the used rockets sometime in September or October.