In which context is the concept of fare routing primarily used?

The concept of fare routing is primarily used in the context of setting international airfare pricing. Fare routing involves the specific path that a passenger's itinerary takes from the point of origin to the destination, and it is critical in international travel because it can significantly influence the cost of the airfare.

Unlike domestic flights, which may have fixed pricing structures, international fare routing requires consideration of various factors such as the countries involved, layover regulations, and distance, all of which can affect the fare. Fare rules can differ from one international market to another, necessitating a more complex understanding of how routes are constructed and priced.

Other contexts such as evaluating discounts on luxury services or calculating ticket prices for train travel do not typically involve the intricacies of fare routing relevant to international flight pricing. While domestic flights may also utilize fare calculations, they generally don't have the same level of complexity and variability as international fare routing.