CREATE TABLE table_42235 ("AIRLINE" TEXT, "AIRLINE  ( in Arabic ) " TEXT, "ICAO" TEXT, "CALLSIGN" TEXT, "COMMENCED OPERATIONS" FLOAT)

What is the ICAO with commenced operations before 1989?
SELECT "ICAO" FROM table_42235 WHERE "COMMENCED OPERATIONS" < '1989'
SELECT "ICAO" FROM "table_42235" WHERE "COMMENCED OPERATIONS" < '1989'