Virgin Galactic is working to bring itself one step closer to send paying customers into space.

The company will attempt its second key test flight today.

It will be the highest and fastest test flight so far.

The VSS Unity will take off from Mojave Air and Space Port in California.

Virgin Galactic made history in December when the rocket-powered plane reached an altitude of more than 50 miles above the earth's surface, which is the goal for the commercial space missions.

The company will conduct more test flights in the next few months.

Founder Richard Branson hopes commercial flights could start as soon as July and he plans on being one of the first to ride.