Question: If the passengers are 15,505,566, what is the iata code?
SQL: SELECT "IATA Code" FROM "1-18047346-4" WHERE "Passengers" = '15,505,566';

Question: If the location is Chicago, Illinois, what is the airport name?
SQL: SELECT "Airport Name" FROM "1-18047346-4" WHERE "Location" = 'Chicago, Illinois';

Question: If the amount of passengers is 15,505,566, what is the %/chg. for 2009/10?
SQL: SELECT "% Chg. 2009/10" FROM "1-18047346-4" WHERE "Passengers" = '15,505,566';