CREATE TABLE table_51594 ("City" CLOB, "Country" CLOB, "IATA" CLOB, "ICAO" CLOB, "Airport" CLOB)

What is the IATA of Madrid-Barajas Airport?
SELECT "IATA" FROM table_51594 WHERE "Airport" = 'madrid-barajas airport'
SELECT "IATA" FROM "table_51594" WHERE "Airport" = 'madrid-barajas airport'