A few years back was operating ex Heathrow in the evening.
That afternoon a storm came through and shut the airport for the best part of two hours.
The curfew was lifted until all aircraft were where they had to be either in or out.
We left at 1am.
Makes sense when slots are tight.
And the 146 was allowed into SYD during curfew, but in on 34L and out on 16R.
I used to drive the AN freighters.
halas