umm.. meters maybe? not kilometers.
btw: noticed your post in the EAW forum..
If your looking for the view distances in EAW they vary by ,exe and modifications. There are long, medium and short range graphics for the planes.
Some like 1.28e and some scenarios actually need the middle range graphic replaced due to a mix-up. See the EAW forum for any questions / links.
Oh, it's not just about the EAW! Firstly, there are another games where we can do some kind of manipulations with this parameters. Here is that I can remember offhand- Lock on, Il2 shtormovik (with the daidalos team patch), strike fighters. And secondly, I'm interested in this subject on its own.
Yes, not km but meters, of course.