Virgin Orbit plans to use a modified Boeing 747 with a rocket attached under its wing. Once in flight, the rocket will set off, taking small satellites from seven customers into orbit in space, in what is known as a horizontal launch.
The mission has been given a window for take-off from 2216 GMT on Monday but that is dependent on the weather plus other scheduling and system issues, and Virgin Orbit said there are back-up dates in mid and late January.
A successful rehearsal for the launch was held on Thursday, the company said in its statement.
(Reporting by Sarah Young; Editing by Kate Holton)
