CREATE TABLE table_40672 ("AIRLINES" TEXT, "IATA" TEXT, "ICAO" TEXT, "CALLSIGN" TEXT, "COMMENCED OPERATIONS" FLOAT)

Who is the callsign that has ICAO of SCO?
SELECT "CALLSIGN" FROM table_40672 WHERE "ICAO" = 'sco'
SELECT "CALLSIGN" FROM "table_40672" WHERE "ICAO" = 'sco'