North Texas Regional Airport / Perrin Field (IATA: PNX, ICAO: KGYI, FAA LID: GYI) is a county-owned airport in Grayson County, Texas between Sherman and Denison. Formerly Grayson County Airport, the airport was renamed in November 2007. Several buildings are occupied by businesses, Grayson County government agencies, and Grayson County College.

Most U.S. airports use the same three-letter location identifier for the FAA and IATA, but this airport is GYI to the FAA and PNX to the IATA (which assigned GYI to Gisenyi Airport in Gisenyi, Rwanda).

The northern extension of State Highway 289 passes the airport on the west side.