+xA long time ago I believe aircraft symbols were green unless they were a threat. They've been white for a long while now.
You really don't want them to stand out unless they are something to worry about. As more and more people get electronic conspicuity this will become more and more of an issue. I know it's tempting at first to want to see them all, but it isn't helpful.
Thanks Tim and makes sense. Anyway I have noticed they start going red and "screaming" when close
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