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National UFO Reporting Center Sighting Report
Occurred : 6/4/2008 18:59 (Entered as : 06/04/08 18:59)
Reported: 6/5/2008 9:14:14 PM 21:14
Posted: 6/12/2008
Location: Chicago, IL
Duration: 1 sec
Characteristics: There were aircraft in the vicinity or aircraft chasing the object
Fighter Jet over Chicago

All I heard was a fighter jet accelerate overhead. A fighter jet in Chicago and no air shows anytime soon... this may help if there was another report.