While Orbital Sciences waits for the state of Virginia to turn over its new Wallops Flight Facility launch pad, boosters for the companyโ€™s Antares rockets are stacking up.

โ€œWeโ€™ve got a lot of launch vehicle hardware sitting at the launch site right now,โ€ Orbital executive Mark Pieczynski said at the American Institute of Aeronautics and Astronautics Space 2012 conference in Pasadena, Calif., earlier this month.

Three boosters are on site at Wallops, and a fourth is nearby at a rented facility, Pieczynski said.

A few days after Orbital is cleared to begin using the launch pad โ€” approval has been pending for months, but appears to be on track for completion by the end of September โ€” the company plans to roll out a test vehicle to run through fueling operations, a procedure known as a โ€œwet dress rehearsal.โ€ About two weeks later, Antaresโ€™ engines will power up for the first time at the launch pad for a 29-second static test-fire.

โ€œAt this point, weโ€™re simply waiting for the state of Virginia to hand us the keys so we can take the vehicle out there and erect it on the pad,โ€ Pieczynski said.

If all goes well, Orbital anticipates rolling out a second vehicle for a demonstration launch a month later.

Antares is a two-stage, medium-lift rocket that Orbital plans to use to fly resupply missions to the international space station for NASA.

The company also is considering flying high-inclination orbits from Wallops for the U.S. military and other customers. โ€œWeโ€™d fly out of Virginia, make a dogleg over the [North Carolina] Outer Banks, turn right and fly down the eastern coast of the United States,โ€ Pieczynski said.

The company also is looking at West Coast options for Antares launches, including Alaskaโ€™s Kodiak Island and Vandenberg Air Force Base, Calif.