Marcia Dunn

AP Aerospace Writer

CAPE CANAVERAL, Fla. — Virgin Galactic's Richard Branson said Thursday his spaceship has just a few more test flights before he jumps on board for the first tourist trip.

The British billionaire celebrated his 69th birthday at NASA's Kennedy Space Center during 50th anniversary festivities for humanity's first moon landing. His guests were 100 other aspiring astronauts who have put down deposits to launch into space with Virgin Galactic. Like Branson, many in the crowd were inspired to fly into space by Apollo 11, which he called "the most audacious journey of all time."

Branson said three or four test flights will be conducted from New Mexico, beginning this fall, before engineers allow him to fly. The two suborbital test flights to date — conducted in December and February over California's Mojave Desert — provided several minutes of weightlessness.

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Branson declined to say when his flight might happen.

"My track record for giving dates has been so abysmal that I'm not giving dates anymore. But I think months, not years," he told The Associated Press.

Virgin Galactic test flights

The company is in the process of moving from Southern California to Spaceport America in the New Mexico desert near Truth or Consequences, which has set everything back four months, according to Branson. The test pilots need to practice landing there, he said, before passengers tag along.

"I certainly won't go into space before brave test pilots feel 100% comfortable that we've checked every box," Branson said.

MORE:After years of delays, Virgin Galactic prepares for spaceflights from NM

In 2014, the company's experimental space plane broke apart during a California test flight, killing the copilot.

The winged spaceship is dropped in flight from a custom-designed airplane; once free, it fires its rocket motor to hurtle toward space before gliding back to Earth like NASA's old space shuttles.

The latest test flight by VSS Unity reached an altitude of 56 miles (90 kilometers) while traveling at three times the speed of sound.

'This is my life coming full circle'

About 600 people, ranging from their teens to early 90s, have reserved a seat, according to a company spokeswoman. Tickets are $250,000.

Maryann Barry bought a ticket less than a month ago. She grew up near Cape Canaveral during the 1960s, and her late brother worked on NASA's Saturn V moon rockets.

"This is my life coming full circle actually," said Barry, 58, who works for the Girl Scouts in Orlando.

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When asked if she'll be afraid, Houston violinist Debbie Moran, 62, said she's trying to do everything she's ever wanted to do in life before her spaceflight in another few years.

"We all know it's not the safest thing in the world," she said. "I still have not told my mother."

"Everybody is fearful. But the point is you have to overcome the fear to get the excitement," said Arvinder Bahal, 73, a real estate investor from Boston who can't wait to see the world from afar without boundaries.

Moon landing inspired Branson

Branson said he did not remember his 19th birthday in London on July 18, 1969. But Neil Armstrong and Buzz Aldrin's moon landing on July 20, 1969, was forever etched in his memory.

Watching those first lunar footsteps on a little black and white TV, with his sisters and parents in the English countryside, was a turning point for him. He said it's why Virgin Galactic exists today.

MORE:Apollo 11 moon landing celebrated as pioneering milestone, but it was really about winning the space race

He lifted a glass of Tang — the powdered orange drink made famous on America's pioneering spaceflights — as he made "a toast to space past, space present and, even more important for us all in this room, space future."

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute's Department of Science Education. The AP is solely responsible for all content.

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