Dunno, as sadly I failed to appreciate just what I was seeing back then, although I think your date of 1986 might be slightly off. I took the 146 pic in April 1988. I well remember seeing PSA airplanes at LAX, SAN and even PHX in early April, but by the time we went home later in the month there were hardly any airplanes left with PSA on them - they all had USAir titles. Witness the following:
Click for large version
Photo © Andy Martin
PSA fuselage titles, PSA titles removed from the tail, and a US(Air) registration.
At the same time, American were flying a bunch of 737-300s and 146s around in Air Cal colors - one day, I'll upload a few of those too!