in the driver's seat

box seat

A favorable vantage point.

catbird seat

An enviable position, often one of great advantage.

fly by the seat of one's pants

To pilot an aircraft without the aid of instruments and without a flight plan, using only instinct, visual observation, and practical judgment.

have a seat

A polite directive to sit down

ringside seat

Any vantage point providing an excellent view.

take a back seat

To adopt a position of noninvolvement.

take the front seat

to take priority