EXHIBIT 21 Subsidiaries The Plains Company Mountainview Thoroughbred Racing Association Pennsylvania National Turf Club, Inc. Penn National Speedway, Inc. Penn National Holding Company Penn National Gaming of West Virginia, Inc. Sterling Aviation Inc. PNGI Charles Town Gaming LLC Northeast Concessions, Inc. The Downs Off-Track Wagering, Inc. The Downs Racing, Inc. PNGI Pocono, Inc. Tennessee Downs, Inc. Backside, Inc. Audio Video Concepts Mill Creek Land, Inc. Wilkes Barre Downs, Inc.