very large, stealth shaped, as big as a football field. dome on bottom that rotated. an the dome was iluminated

IN 1962 to 1964 I can;t really remember the date my girlfreind an I went to a drive in theather it was called the richland drive-in  in johnstown pa,  as we waited for the movie to start they were showing the usual 5 minutes to go an then food commericals the usual event before the movie   when it was about time for the movie to come on you could here this crackling sound an then the lites an sound went dead also the cars there   there engines and lites went dead, you could here this crackling sound but couldn,t see anything because it was dark,  people got out of there cars an as we looked up  there was an object the size of a football field coming across the sky   it was shaped like a sphere almost like a stealth but 5 times as big   there was a dome on its bottom that was a luminated an seemed to rotate there was greenish blue flames coming from the edges   an it went right down the the skyline an it was y flying . 
I have seen all kinds of shooting stars an unidentifiable objects in my life  but this sighting has never left my mind I will never forget what I saw.
Source of report indicates that the date of the incident is approximate.  PD