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.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, North Texas Regional Airport is assigned GYI by the FAA and PNX by the IATA (which assigned GYI to Gisenyi Airport in Gisenyi, Rwanda).

The airport entrance is at the intersection of Farm to Market Road 691 and Farm to Market Road 1417 on the east side, while the northern extension of State Highway 289 passes the airport on the west side.