You get used to the 'normal' sounds around you.
I live near an NATO airport where Awacs planes are stationed. They are very loud planes and in final approach or directly after departure (depending on the wind) when they pass a little to the north of the apartment building I live in.
When I'm on my balcony it is impossible to have a conversation when they pass.
But now in the winter, when I'm only inside, I can't recall when it was the last time I heard a plane coming over. Totally used to the sound I guess.
There are several operational flights a day. And when they do practice runs, every 15 minutes for hours in a row.
But when another military plane type uses that airbase occasionally, my ears won't miss it.