I find there's more cargo planes up there from about 22.30 onwards, Fedex, dhl, ups etc etc.
There was a plethora of helicopters buzzing into and out of Aberdeen to somewhere in the North Sea a couple of days ago.
There's been a couple of RAF airyplanes leaving pretty trails as they practise their aborted landings at various airports too.
We had a Globetrotter on Friday (I think it was yesterday, might have been Thursday) 3 times, one was a touch and go, pretty impressive stuff up close.