We saw a strange looking object up in the sky near Midway Airport

One evening around 6pm (it was dusk by then) Grandma and me was walking the dog over down on 62nd and Rutherford Ave. right over by the factories and warehouses by the railroad tracks.  We had happened to look up at the stars so that I can see if the Planet Venus was out that night?  
Meanwhile, while we were stargazing, there was this odd looking airship that had neither any wings nor any propellers on it.  It was in a shape of a bottom of an ice-cream bowl. it made a low gargle-ling humming sound.  It had started to floated eastward towards by Midway Airport, and then this object had flown out west just like a shooting star.  And we’ve never seen it again. My grandma said that it was a shooting star, but I saw it different, it was more of a strange object to me rather than a shooting star.
 Back then, I was 12-years-old at the time back in 1972, we were living over on xxrd and Oak Park Ave. I was living with my grandmother at the time, because my mother had passed away in 1970  During that time frame my life was much different than any other ordinary child, due to my handicap disability my experiences were un-explainable.
 Up til this day I often have nightmares about UFOs and that day that we've seen this strange looking thing. 
Witness indicates that the date of the sighting is approximate.  PD