Final answer:
The AirFi box is usually turned on by the cabin crew as part of their pre-flight duties, ensuring in-flight entertainment is available to passengers.
Step-by-step explanation:
The responsibility of turning on the AirFi box at the front and rear of the plane typically falls to the cabin crew or sometimes the flight crew, depending on the airline's standard operating procedures. The cabin crew usually perform this task as part of their pre-flight preparations to ensure the in-flight entertainment system is available for passengers once the flight commences. In some cases, it may also be a specific duty of the lead flight attendant or purser.