Well I'm learning a lot here, and now based on the replies, I'm
starting to wonder if there's a small plane airline that's ferrying
passengers from Seattle to the Island, and if those pilots stick to a
routine route? Eh just another crackpot theory :^)

But I can say that of the 14 different homes I've lived in so far, this
has the most close planes going over. Wait a minute - I lived next to a
military air base in laguna Hills, Ca. once and those close fighter
jets were actually a bit peskier. :^o

A detail I left out earlier is that I create audio content for a
living. Out of the home. So I'm absolutely way more sensitive to the
pesky noises outside than the average person, no doubt about it.