flying a phantom boat tail
 

Professor Alberto Morelli of the Turin Polytechnic Institute is one who has used language which describes a phantom boat tail which trails behind a truncated streamline body of particular tail length.
The first image below is a conventional loop-antenna fairing used by all Allied air forces in WW-II.
The second image is of an airborne radar system fairing,intentionally truncated,but at a sufficient aft-body length to generate,with the airflow,the remainder of the tail.
http://i1271.photobucket.com/albums/...titled45_1.jpg
http://i1271.photobucket.com/albums/...titled46_1.jpg

Would it be fair to assume that when the aircraft is banking or there is a side wind, that the truncation doesn't work as effectively as the full form?

Airplanes don't see significant side winds unless they are on the ground or the pilot is using rudder.

what frank said. Planes have it far better than us ground huggers, they live in a sea of air. sure there are different layers in different directions, hence the turbulence in flight. For the most part it is smooth sailing.

It's basically a difference in viscosity: Planes & birds "fly/swim" through air (light & compressible) and submarines & fish "swim/fly" through water (dense & incompressible).

I don't have a handy reference, but isn't air basically incompressible until you reach transonic speeds?

Also—supercavitating torpedoes and shark skin.

effectively
 

*If the pilot is finessing the aileron and rudder controls properly,a banked turn on final approach will have nearly perfect longitudinal flow.
*If you're screaming into turns to burn off airspeed for a short field landing,then yes,the flow is a mess,but you'll have full flaps anyway,and the drag of the avionics pod will be nothing in comparison.
*Side winds will require crabbing,but it takes quite a crosswind to cross-up a plane so much that the tails would get dirty.If it's a problem,then you're probably looking for an alternate airfield.

compressibilty/cavitation
 

*Yes,air is considered an incompressible fluid at 'low' speed.
*The supercavitating torpedo is riding within a shroud of gas surrounding the body,created by a portion of the rocket's flow,directed forward to discharge nozzles in the nose.It essentially never touches the water.
*The shark skin has water sequestered within the surface matrix,and the outer flow is 'rubbing' against water,rather than a solid surface.
*Penguins carry air,embedded within their feathers to isolate a portion of their surface area from the water.Gentoos are the fastest,with a frontal area based Cd 0.07.
*Russian ice breakers have 'bubblers' which 'lubricate' the interface between the hull and ocean water.Like the Squall rocket-torpedo.