CREATE TABLE table_203_340 (id NUMBER, "rank" NUMBER, "airport" CLOB, "passengers handled" NUMBER, "% change 2011 / 12" NUMBER)

how many passengers were handled in an airport in spain ?
SELECT SUM("passengers handled") FROM table_203_340 WHERE "airport" = 'spain'
SELECT SUM("passengers handled") FROM "table_203_340" WHERE "airport" = 'spain'