CREATE TABLE table_8239 ("ISLAND" TEXT, "CITY / TOWN" TEXT, "ICAO" TEXT, "IATA" TEXT, "AIRPORTNAME" TEXT)

Which city has an ICAO of gvsf?
SELECT "CITY / TOWN" FROM table_8239 WHERE "ICAO" = 'gvsf'
SELECT "CITY / TOWN" FROM "table_8239" WHERE "ICAO" = 'gvsf'