SHUTTLE AWARD AVAILABLE FOR ONLY 15,000 MILES.
Through 12/31/00, you may redeem an award on US Airways Shuttle for 15,000 miles.
http://www.usairways.com/dividendmiles/redeemingmiles/usairways/standard.htm

for details.

Seems to me this is not a particularly good use of mileage unless you use it for a full fare weekday peak ticket with no corporate discount available. Otherwise you can get shuttle fares roundtrip under $200 - and as low as $110 on the weekend.