What kind of agreement is an interline agreement?

An interline agreement is a crucial understanding between airlines that outlines how they will cooperate in selling and handling tickets for routes that involve multiple carriers. This agreement allows for the seamless transfer of passengers, baggage, and sometimes even travel itineraries between airlines, making it easier for travelers to book complex journeys that require flights on different carriers. Interline agreements enhance connectivity and efficiency in the airline industry, allowing for coordinated schedules and streamlined check-in processes.

The context of the other options highlights that they pertain to different areas of the travel industry, such as hotel collaborations, interactions between travel agencies and tour operators, or car rental partnerships, none of which relate to the specific cooperative arrangements between airlines that define interline agreements.