CREATE TABLE table_203_515 (id NUMBER, "rank" NUMBER, "city" CLOB, "passengers" NUMBER, "ranking" NUMBER, "airline" CLOB)

which airline carries the most passengers ?
SELECT "airline" FROM table_203_515 ORDER BY "passengers" DESC LIMIT 1
SELECT "airline" FROM "table_203_515" ORDER BY "passengers" DESC FETCH FIRST 1 ROWS ONLY