Not a passenger flight, but a UPS freight-only flight crew was attacked in the cockpit by a (disgruntled) UPS pilot seeking revenge while in mid-flight. (The attacking pilot got onboard by pretending to need a lift back to the UPS headquarters.)
I think we’re all confused and no wonder when there was such a mish-mash of airliner names...US Air and Pacific Southwest. I don’t think UPS was part of what we’re thinking of...the passenger (shooter) had been an employee of US Air. Glad there’s not a test on this subject but NOW we have to sort out the one that you believe happened with a UPS plane...Do you think it was also in the bay area? Strange that there were so many in the late ‘70’s and ‘80’s just in CA.....
“”Pacific Southwest Airlines Flight 1771 was a scheduled domestic passenger flight from Los Angeles to San Francisco. On December 7, 1987, the British Aerospace 146-200A, registration N350PS, was intentionally crashed in San Luis Obispo County near Cayucos,[2][3] after being hijacked by a passenger.
All 43 passengers and crew aboard the plane died, five of whom, including the two pilots, were presumably shot dead before the plane crashed. The perpetrator, David Burke, was a disgruntled former employee of USAir, the parent company of Pacific Southwest Airlines.[4] The crash was the second-worst mass murder in Californian history, after the similar crash of Pacific Air Lines Flight 773 in 1964. It was the second fatal crash of PSA, after Pacific Southwest Airlines Flight 182. The motive for the hijacking and resulting mass murder-suicide was anger towards Burke’s former boss, Ray Thompson, who had refused to reinstate Burke after he had been fired for theft. Thompson was on Flight 1771 and was the first victim.[5]