WASHINGTON (AP) -- U.S. airports, including Los Angeles International and O'Hare International in Chicago, are already experiencing delays in waiting lines as a result of automatic federal spending cuts, Homeland Security Secretary Janet Napolitano said Monday.

Both of those big-city airports routinely suffer delays. Napolitano was describing wait times inside airports. The Federal Aviation Administration reported Monday there were no significant flight delays in either Los Angeles or Chicago.

Napolitano, who spoke at a Politico-sponsored event on the 10th anniversary of DHS, said delays will become worse. The Transportation Security Administration and Customs and Border Protection agencies, which are part of the Homeland Security Department, are issuing furlough notices and have cut overtime for employees.

Napolitano said she expects a cascading effect during the week, with wait times expected to double in worst cases.