seen in 1972 and seen later too

dark for about 20 30 minutes me and my cousin were catching fire flies and thought that what we were seeing coming at us was a low flying plane.  It had flashing orange lights on the nose and both wing tips was huge with a wing span of at least 600 feet and was traveling east to west at an altitude of about 500  
It was toward the end of August in 1972 in coldwater Alabama at about 8 o’clock at night it had been to 750 feet and moving at about 40 to 60 miles an hour and had no visible system of propulsion.  
The craft moved in total silence and was triangle shaped but indented in the rear making it resemble the wing of a fighter jet with no body in thickness and configuration it passed directly over us without a sound and kept going in the direction of Birmingham  it was seen 1 time before and several times since but never checked out I do not no if it has been seen recently or not,
Witness elects to remain totally anonymous; provides no contact information.  PD