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

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'