The notification period with respect to airlines is usually for delays or cancellations that are beyond the window of an hour, because that's sort of the threshold at which it's difficult for an airline to make up the time in the air. That's on departure.
If there's something unusual about it, in terms of a situation that will have significant knock-on effects with, say, 10% of air passengers, that's when we get notified by a particular carrier of—