We noticed that there were quite a few Asian airlines that update pricing late on Thursday, say 11 PM for sale on Friday Saturday Sunday.
These strategic fares are loaded late in the business week in order to beat the competition and last only three days to 1 week. Not enough time for the competition to load fair to compete against them.
If you doing cross Pacific or Asian travel, you might look at that shopping period of late Thursday or early Friday morning, are some of the fares are actually conditional on seat loads.