I've just gained access to the site-analytics tools on Aviation.SE, and, looking at the traffic stats, an odd pattern shows up:
The overall-pageview, site-visit, and new-visit stats all show a distinct sawtooth pattern, where Fridays are almost uniformly the least-trafficked day of the week, with all three of these stats showing a drop of about a third to a quarter on Fridays compared to the highest-traffic day of the week.
The upvote stats show a similar tendency for the Thursday-Friday-Saturday zone to be a slow part of the week, although there's a lot more variation in the graph and the nadir falls much less uniformly on Friday than for the view/visit stats:
What is causing this strange phenomenon, and do other Stack Exchange sites exhibit it as well?