A heliochopper!

Being so close to Aberdeen (Dyce) airport there are always helicopters coming and going, I read somewhere it had the most flights in and out than any other airport, I'm not sure if that was/is true but there are choppers coming and going almost constantly (virtually all personnel working on the North Sea Oil Rigs will fly via Aberdeen).

Most of them come in from the North East which is the other side of the airport from mum's house, but occasionally they come pretty low over the house and they are LOUD! Even with treble glazing windows you can still hear them from inside.