ATLANTA (AP) - Federal authorities are investigating Atlanta's airport, to determine if it illegally diverted money to the city.

The Atlanta Journal-Constitution reports the Federal Aviation Administration sent notice of the investigation to the city of Atlanta, which owns and operates Hartsfield-Jackson International Airport.

The FAA also subpoenaed airport invoices from 2016 through mid-2018.

The notice says the city acknowledged invoices totaling more than $100,000 "were wrongly paid from airport funds" and reimbursed the airport.

Federal regulations prohibit spending airport money on anything other than the airport's capital or operating costs.

The FAA's investigation notice cites a newspaper report that the city may have used airport money to pay legal fees involving a corruption probe into City Hall.

Atlanta Mayor Keisha Lance Bottoms' spokesman says the city is surprised by the FAA filing.

Information from: The Atlanta Journal-Constitution, http://www.ajc.com

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