Northrop Grumman Space Systems, formerly Orbital ATK,, is a company that specializes in small to midsized space launch vehicles. They service a variety of government contract for space vehicles, rockets, and launch systems.
One of thier more successfull products in the Pegasus series of orbital rockets. They use a heavily modified Lockheed L-1011 to lift the rocket, carried under the wing to altitude, and air launch it into space. The L-1011 known as "Stargazer" is the last flying L-1011 in the world.
There are no tours, but Stargazer can be seen from many vantage points about the airport read more