user: Question: If the passengers are 15,505,566, what is the iata code?
Columns: ['Rank', 'Airport Name', 'Location', 'IATA Code', 'Passengers', '% Chg. 2009/10']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'John F. Kennedy International Airport', 'Queens, New York', 'JFK', '22,702,882', '0 5.8%']
SQL:

assistant: SELECT "IATA Code" FROM "Table" WHERE "Passengers" = '15,505,566';