I was drawn to it by lights that looked like the ones planes turn on on landing.But these came crossed one another and also as driving toward it appeared to not be moving.Once close i decided not to turn but to go to it.Once under it i could hear it and make out movement in cockpit.There seemed to be a light green light in the cockpit.After about 10 mins it started to drift toward power lines and airport.I entered the auto and decide to follow even though my wife was in a state of panic.I made a turned around and went to bridge that goes over rr yard.Once on top had clear view of chicago skyline and saw nothing not even planes .Once home called police and they laughed but after a hour called be back got all info for ufo center.Only recently have i been able to find record of it on line.It was witnessed by my ex-wife who won't even talk about it today. i had never believed in ufo's til that day.I stood under it and appear mealtaic,saw moment in cockpit, heard it and know it was something about the size of a 707 but only wing shape. i know it had been seen but never heard a word or even knew a record of this existed until a few weeks ago.I hope to find out what it was before i'm gone,