Pilot
An Expert Aviator is called an "Ace".
A cultures expert is called an ethnologist.
A bully expert is called a bullnation
A grammar expert is called a grammatician or a grammarian.
The pilot episode of the Office is actually called The Pilot.
a pilot. and a co-pilot.
A female airplane pilot is simply a pilot. She could be a Captain.
Expert advice or expert guidance.
An expert in his field is often called a specialist or an authority.
A hot air balloon pilot is called an aeronaut.
an expert on China is called a sinologist.