What is the primary purpose of a passenger ticket?

The primary purpose of a passenger ticket is to serve as a legal agreement between the passenger and the airline carrier. This agreement outlines the terms and conditions of travel, including the rights and responsibilities of both parties. The ticket specifies essential details such as the travel itinerary, fare, and any applicable rules for changes or cancellations. This legal aspect is crucial because it establishes the contractual relationship that governs the travel experience, providing clarity and protection to both the passenger and the airline.

In addition, while a ticket may contain information relevant to a passenger, such as baggage details or frequent flyer information, these are secondary to its role as a legal document. The other options mentioned do not encapsulate the primary function of a passenger ticket, as they pertain to specific aspects of travel management rather than the foundational legal agreement that the ticket represents.