A couple of times in the past when I’ve been outside and seen a lone jet high above I’ll check flight radar to see if it’s squaking and where it’s been and where it’s going.
Good clean fun on a slow day.
I'm pretty sure that both iOS and Android (probably others), allow you to issue a voice command: "Planes overhead," and using your location, will give you details of the flights in your vicinity. You might be able to combine that with the named websites on this thread.