Table: airport_passengers
Columns: rank
airport_name
location
iata_code
passengers
chg_2009_10

Question: If the passengers are 15,505,566, what is the iata code?
SQL: SELECT "iata_code" FROM airport_passengers WHERE "passengers" = '15,505,566'

Question: If the location is Chicago, Illinois, what is the airport name?
SQL: SELECT "airport_name" FROM airport_passengers 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 airport_passengers WHERE "passengers" = '15,505,566'