We have a fair amount of civil aviation here in Redding, both at Redding (RDG) airport, and at Benton Field (O85)...most of it is mainstream, although we have an active local EAA chapter and some interesting private craft at both.
There's also CDF and USFS facilities at RDG and during extreme fire situations, contracted helos will stage at O85.
The Long EZ was headed due north, over the I-5 corridor at around 6,000ft when I grabbed the shots.
We get a huge amount of north/south over-flight here, both military and civil.