Aero California was a Mexican airline that is no longer around. They flew DC9's mostly within Mexico, but had a daily Tucson-hermosillo flight and a daily flights from Los Angeles to six cities in Mexico.
I was living in Los Angeles at the time and it was kind of funny to see tiny Aero California DC9's at the Bradley International terminal among all those giant 747's.
This timetable did not include a route map, which has always amazed me when airlines didn't show one in their timetables. Guess they wanted you to look at the entire timetable to see where they flew.