“”””Sorry - the one I remember is PSA and a Cessna midair collision over San Diego - 1978 - not a shooting.””””
Sorry for my bad reporting re the date. I used my memory cells.
The PSA crash happened in 1987 on a flight from LA to SFO.
Here is the link-—
https://en.wikipedia.org/wiki/Pacific_Southwest_Airlines_Flight_1771
That must be the one I was trying to remember with a former employee being the culprit...I thought he had worked for a freight company but it was US Air...
We were living in Southern CA at the time each of these happened..San Diego, Cerritos, San Luis Obispo...We had a flight operation at John Wayne airport at the time so all of those caught the attention of students/flight instructors and owners of flight schools.