SSTL is a world leader in the production of low-cost small satellites, and it was keen to explore the possibility of working with Virgin Galactic on a way to get these spacecraft into orbit much more cheaply than is currently possible.
The concept would be somewhat similar to the US Pegasus system, which uses a former airliner to lift a booster to 40,000ft, before releasing it to make its own way into space.
Virgin Galactic's aim is to provide an air-launched system which is faster, cheaper, and more flexible.
http://www.bbc.co.uk/blogs/thereporters/jonathanamos/2009/11/launcherone-virgins-galactics.shtml
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