What defines an Intermediate Stop during a flight?

An Intermediate Stop is defined as a city where a flight stops between its origination and termination point. This means that the aircraft makes a scheduled stop at this city for the purpose of allowing passengers to board or deplane, as part of the flight's route. It is an essential aspect of flight operations, as it can serve multiple purposes, including picking up additional passengers who are traveling to the ultimate destination, as well as providing an opportunity for those who are not continuing their journey to exit the aircraft.

This definition is distinguished from other options, which do not encompass the broader function of an Intermediate Stop. For instance, a stop solely for refueling focuses only on the aircraft's operational needs rather than passenger services. A layover exclusively for crew rest does not entail any passenger connectivity and is more about the operational logistics of the flight crew. Lastly, a stop that allows only connecting passengers to board would not adequately describe the full treatment of an Intermediate Stop, which can include both boarding and deplaning passengers. Hence, identifying an Intermediate Stop as a city where the flight halts during its journey captures the essence of the term accurately.