CREATE TABLE "see_also" (
  "airlines" text,
  "iata" text,
  "icao" text,
  "callsign" text,
  "commenced_operations" real
);

Question: Who is the callsign that has ICAO of SCO?
SQL: SELECT "callsign" FROM "see_also" WHERE "icao"='sco';

Question: Who is the commenced operations that has icao of slk?
SQL: SELECT "commenced_operations" FROM "see_also" WHERE "icao"='slk';

Question: Who is the call sign that has a commenced operation before 1976?
SQL: SELECT "callsign" FROM "see_also" WHERE "commenced_operations"<1976;