Get a SDR and run a flight tracker. I have one that passes data out to https://www.flightradar24.com/
It is kind of cool to see (in real time) tracking data on aircraft around you and if you pass data to fr24 they give you a free premium account.
If you don't have something for it. Home assistant for various smarthome/home automation stuff that is local-only (you can do cloud stuff if you want but don't have to).
I do have a cool app on my phone that lets me know when the ISS is about to fly over. Also a group of 4-5 blackhawks flies over my house monthly or so tho i won't try to track those.
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