[jjk166]

> Well connected people probably have access to the kind of insider information that would allow them to escape the hot zone with hours, even days of advance.

Which would not result in them scrambling to get airborne all at once, and thus not produce the signal that this site is set up to look for. The elites may have a more precise estimate on when exactly a war's going down, but they also have no reason to stick around ground zero till the last minute.