Sherman Municipal Airport (ICAO: KSWI, FAA LID: SWI) is a city-owned public airport located 1 mile (1.6 km) mile southeast of the central business district of Sherman, in Grayson County, Texas. Many U.S. airports use the same three-letter location identifier for the FAA and IATA, but this airport is SWI to the FAA and has no IATA code.