Ship : Captain :: Aircraft : ? Pick the word that completes the analogy.

The relation is a craft : the one person who commands it and holds it on its course. A ship answers to its captain; an aircraft answers to its pilot. 'Navigator' is the sharpest trap, because he works out the course — but he hands it to the man at the controls and never commands the craft. A steward waits on the passengers in the cabin and an engineer looks after the engines, so neither takes charge of the flight.