CREATE TABLE table_22096 ("Rank" FLOAT, "Airport Name" TEXT, "Location" TEXT, "IATA Code" TEXT, "Passengers" TEXT, "% Chg. 2009/10" TEXT)

If the passengers are 15,505,566, what is the iata code?
SELECT "IATA Code" FROM table_22096 WHERE "Passengers" = '15,505,566'
SELECT "IATA Code" FROM "table_22096" WHERE "Passengers" = '15,505,566'