Elon Musk will be heading to space, but he is already eyeing another company’s spacecraft to get there.

The Space X founder is one of several people that have already booked a ticket for a future flight on Richard Branson’s Virgin Galactic’s (SPCE) space trips, according to The Sunday Times, as reported by Business Insider. The Wall Street Journal also confirmed the flight reservation by Musk.

It was unclear how far up the waiting list for a flight Musk was at the time of writing.

Branson, 70, told The Sunday Times that Musk paid $10,000 for a seat on a future Virgin Galactic spacecraft trip, but the date of the flight has not yet been set.

The Virgin Galactic founder told the news outlet that “Elon’s a friend and maybe I’ll travel on one of his ships one day,”

Branson took off with a full crew to the edge of space on the VVS Unity Virgin Galactic spacecraft on Sunday. He was the first billionaire to reach the edge of space, 53.5 miles above sea level.. The spacecraft took off from New Mexico in a successful launch.

Blue Origins founder Jeff Bezos is set to fly to space on July 20 aboard the New Shepard rocket.

Branson has plans to fly tourists to the edge of space in 2022.

He told The Sunday Times that other tickets for space flights onboard the Unity spacecraft have been purchased by Tom Hanks, Justin Bieber, and Lady Gaga, Business Insider reported. A total of about 600 people have bought tickets from about 58 different countries, Branson confirmed to the news outlet.

Total cost of a one-hour trip on the Virgin Galactic flight costs $250,000, including training and spacesuit, Business Insider reported. The WSJ reported that Virgin Galactic has collected $80 million in sales and deposits so far for future flights of its spacecraft.

At 3 a.m. the morning of the successful takeoff, Musk showed up in Branson’s kitchen to wish him “good luck” the billionaire Virgin founder posted on Twitter.

He wrote in a post, “Great to start the morning with a friend,” along with a picture of the two space entrepreneurs.

Shares of Virgin Galactic were trading at $52.66 as of premarket hours on Monday, up $3.46, or 7.03%.

Tesla and SpaceX boss Elon Musk hopes to be able to one day launch several space ships to Mars
Tesla and SpaceX boss Elon Musk hopes to be able to one day launch several space ships to Mars POOL / HANNIBAL HANSCHKE