Actual smoke would be known as exhaust.
The lines in the sky that follow a high-flying jet, however, are known as condensation or "con" trails. They are not smoke but condensation in the atmosphere caused by the disruption of the air by the airplane's passage.
There does not appear to be another name for a pigs tail. A pigs tail is typically short and curly.
caudal fin.
all of the Australian planes were blue or yellow with a bright red tail
Yes
White smoke coming from your tail pipe often indicates an issue with your coolant. The smoke comes from burning coolant. The engine sputters and white smoke is likely an issue with the head gasket.
the black box is in the tail of all public planes
No! there been even worse ones like planes exploding. The tail falling off planes then the plane crashes. Planes braking apart on the runway.
White smoke indicates a blown head gasket, the smoke is coolant burning
The Irish national airline Air Lingus uses airplanes that are green on top and tail. Iraqi Airways is another airline which has traditionally used green in their livery.
Unburnt fuel
Empennage is an aviation term used to describe the tail section of an aircraft. The empennage is also known as the tail or tail assembly; all three terms may be interchangeably used.
If you ever see a commercial airliner in flight behind it there will be a white tail folowing it. This is the smoke trail.