MOJAVE, Calif. — Virgin Galactic’s tourism spaceship climbed more than 50 miles high above California’s Mojave Desert on Thursday, reaching for the first time what the company considers the boundary of space.

The rocket ship hit an altitude of 51 miles (82 kilometers) before beginning its gliding descent, said mission official Enrico Palermo. It landed on a runway minutes later.

“We made it to space!” Palermo said.

Thursday’s supersonic flight takes Virgin Galactic closer to turning the long-delayed dream of commercial space tourism into reality. The company aims to take paying customers on the six-passenger rocket, which is about the size of an executive jet. Virgin Galactic founder Richard Branson has said he wants to be one of the first on board.

Branson greeted the two pilots after the test, declaring “Space is Virgin territory!”

Virgin Galactic considers 50 miles (80 kilometers) the boundary of space because that is the distance used by the U.S. Air Force and other U.S. agencies. That’s different from a long-held view that the boundary is at 62 miles (100 kilometers). Virgin Galactic CEO George Whitesides noted that recent research favors the lower altitude.

Whitesides said a review of the flight’s data will last into the new year, and there will be more test flights, some with company employees as passengers. He wouldn’t estimate when commercial passenger trips might begin.

“This is a huge step forward and once we look at the data we’ll see what that pathway is,” he said.

At the start of the test flight, a special jet carrying the Virgin Space Ship Unity flew to an altitude near 43,000 feet (13,100 meters) before releasing the craft. The spaceship ignited its rocket engine and it quickly hurtled upward and out of sight of viewers on the ground. The spaceship reached Mach 2.9, nearly three times the speed of sound.