From USA Today:
The Transportation Security Administration says it strives to return the money. But since 2005, Congress has let it keep the money for its operating budget.
In 2010, the TSA‘s most recent count, it amounted to $409,085. Passengers at New York’s John F. Kennedy International Airport left the most loose change, $46,918.06, with Los Angeles International Airportpassengers leaving $19,110.83 and $16,523.83 by those at Atlanta’s Hartsfield-Jackson.