  Aviation turbulence is modelled as an interaction between an aircraft and a
vortex tube. The vortex tube can have an arbitrary orientation/offset with
respect to the aircraft. We compare modelling the aircraft (i) as a point and
(ii) having a finite area (wing and fuselage). We consider both vertical and
horizontal acceleration experienced by the aircraft. The baseline vortex tube
has an area which is of the order of the aircraft area.
