Why do people look up to the sky when they hear a plane or helicopter?

I noticed that I do it all the time even though I live close to an airport, you'd think we'd be used to them by now.

Answers:
After 9/11 I think looking up is a good idea
I do too. I think it is because it is so fascinating, that it never gets old.
umm kinda crazy question but I would have to guess because they are looking for the plane!
they don't want it to crash on them
Sometimes the sound of the motor is quite loud and so people hear that motor running and look up because of such a loud noise.
Because that's where they are?

Its the same as looking both ways at a one-way street. Force of habit.
Where else would they look? Down at the ground?!
Its instinct for some reason, whenever people hear a strange noise we always look up, dont know why though
just wanna make sure it's not a spaceship.sheesh..have'nt you seen war of the worlds?.lol jk.
i do the same thing i think it is because we never get tired of seeing them and wondering where they have come from or where they are going
You never know exactly what's making the noise until you look up. You hope to see a really cool plane. Maybe it'll be a stealth bomber or an old prop plane. Humans are curious beings. If all planes looked exactly the same I doubt people wouldn't look up as often as they do.
Paranoia.

Maybe they are coming for *me* this time.
They want to know if it's a bird!, it's a plane! it's Superman!
Yes. It's Superman, strange visitor from another planet with powers and abilities far beyond those of mortal men.

well, you know the rest.
I look up at airplanes because I want to see what kind of a plane it is. You never know when an old warbird might fly overhead!
Hello..whether it be riddles or other questions i always like your replies so thank you ;)..and i guess its the kid inside of us that makes us want to look at the planes..and how come everyone waves at the planes lol
cause they get curios that it might not be a plane or anything and so just to check we look at it.
i do as well. coz its facinating to see how they stay in the sky for such long amounts of time

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