Jose wrote:
In the 1960s and even into the mid-1970s those of us who were airline
pilots based at LAX could fly light singles into LAX and park on our
airline's maintenance ramp (not the passenger terminal ramp).


(Why) did it stop?

Jose

The airline maintenance ramp became too crowded, although it could still
be done with prior permission on some occasions; that is, until 911.
That pretty much ended it.