Any reports from the lots to the south (Anza, BAP)? I've only had the need to park once at BAP on Labor Day weekend and they had plenty of spaces then. I was in their lot around 4am Friday though so maybe I beat the rush as 1/3 of their lot was still open. Every AA flight was oversold that day and would think the UA side would be pretty busy, too.
If the lots to the north are full on Thursday and Saturday morning, those folks have to go somewhere else. Are they heading to Anza or BAP?