fighters set to intercept will attack everything within their range.
that said...
I have noticed that intercept missions "set" in provinces the fighters are not based in do not always work. I don't have an answer on that.
Since not all provinces are "created equal" in the distance arena, an SR fighter in Colmar would hit everything within a 2 province radius while an SR fighter in Montana would only intercept those attacks against Montana.
If you're having a different issue, I don't have the answer
that said...
I have noticed that intercept missions "set" in provinces the fighters are not based in do not always work. I don't have an answer on that.
Since not all provinces are "created equal" in the distance arena, an SR fighter in Colmar would hit everything within a 2 province radius while an SR fighter in Montana would only intercept those attacks against Montana.
If you're having a different issue, I don't have the answer