This is just conjecture no doubt...
But from what I have seen in the early campaign... getting buzzed (and sighted) by one plane (or enemy ship) sets up a double fly over in a few hours, and every few hours after that until you have successfully "lost" them (i.e. significantly changed course). Again... could be coincidence, but on patrols where I was not spotted en route, then hunting was good. And I get spotted, and subsequently buzzed by the double planes, I can't find a ship or sound of one for hours, even days.
If I am close to a enemy port, around 10km or so... then It will not be long before a DD is b lining it right to me.
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