While Jeff Bezos has spent $14 billion to achieve his first space launch, his billionaire rival has built a thriving business, mostly with other people’s money.

The Amazon founder’s space company marked a major milestone Thursday with the first test flight of its New Glenn rocket.

Blue Origin successfully launched the rocket after an attempt earlier in the week was scrubbed. The flight is a crucial test of the company’s ability to compete with Elon Musk’s SpaceX.