What is a frequency code used for in travel?

A frequency code is specifically designed to indicate the days of the week that a flight operates. It helps airlines communicate to travel agents and passengers when specific flights are scheduled to depart. For example, a frequency code might indicate that a certain flight operates only on weekdays, or on specific days like Mondays and Fridays. This information is crucial for scheduling travel and ensuring that passengers can find flights that fit their travel itineraries.

In contrast, seating arrangements, flight departure times, and tracking passenger behavior are related to different areas of travel management and do not fall under the purview of frequency codes. Thus, the function of frequency codes is uniquely tied to the operational days of flights, making this the accurate choice.