Beam of Darkness from Nose of Jet

This happened in the late 1980's.  It was late spring or early summer.  
The sky was somewhat overcast yet still bright.  My then-boyfriend and I were traveling to Big Bend, TX for a camping trip.  We were on the road from El Paso, and we were just outside of Valentine, TX when this happened.  
He was at the wheel and I noticed a jet flying in the distance above, moving left to right as we looked through the front windshield.  The jet was black.  It was close enough to see that it was a jet, but not so close that we could see any logos or other colors that may have been on it.
A beam of darkness shone out from the front end of the jet.  The beam was perfectly straight; it looked like it was coming out of the very tip of the nose of the jet.  It was just like a beam from a flashlight except that it was a beam of darkness.  
My boyfriend saw it too and we talked about it for several minutes while it was in view.  We wondered if a "flashdark" had been invented that would project darkness into a lighted space in the same way that flashlights project light into darkness.  
When I saw your March report from the family in IL that saw the same thing, I decided to make this report.  It was such an odd thing that I've never forgotten it.  I was surprised that the IL family's report sounded exactly like what my boyfriend and I saw.
Witness indicates that the date of the sighting is approximate.  PD