It is most definitely a Shorts 330 or 360. I believe a company called Ameriflight runs regional cargo operations out of SAN
Most days of the week, two to three Shorts aircraft arrive from El Centro in the early evening, and then depart to Ontario about and hour later (give or take).
Apparently, aircraft departing to Ontario from SAN
will take a right turn after takeoff, routing them slowly over Pacific Beach, La Jolla, Miramar and the I-15 corridor up to ONT
. I've seen the Ameriflight aircraft as well as a few cargo 727s do this before.
EDIT: Whoops...I may be mistaken on what I just wrote, but I'm not sure. See my post on your other thread (http://www.airliners.net/discussions/general_aviation/read.main/2296432) for more info.
[Edited 2005-08-27 00:24:18]