What term refers to rules for determining airfares for complicated travel plans?

The correct term for rules that determine airfares for complicated travel plans is construction principles. This term is used in the travel industry to refer to the methodologies and frameworks employed to analyze and calculate airfares, especially for itineraries involving multiple segments or complex routes. Understanding construction principles helps travel agents ensure they are accurately pricing flights and abiding by the fare rules set by airlines, which can vary greatly depending on the specifics of the travel plan. This knowledge allows agents to provide clients with the best possible fare options while adhering to industry standards.

Other choices, while seemingly related to fare determination, do not specifically capture the comprehensive guidelines and methodologies indicated by construction principles. For instance, flight fare guidelines could imply a broad overview of fares without the intricate details necessary for complex itineraries. Similarly, pricing standards and travel cost regulations might pertain to general pricing strategies and legal constraints, but they do not encompass the specific calculations involved in fare construction for complicated travel plans.