It could be related to StackOverflow displaying "Hot Network Questions" in a sidebar, some of which are from the aviation StackExchange, combined with the usual

It could be related to StackOverflow displaying "Hot Network Questions" in a sidebar, some of which are from the aviation StackExchange, combined with the usual phenomenon of upvoted stories attracting similar submissions. Incidentally, I find this sidebar extremely distracting; maybe it's time for a plugin/script to fix it.