Normal fare rules stipulate that an international ticket should be issued by the first international airline. There are a few exceptions, z.B. if the first codeshare international flight is a codeshare flight, if the first non-code-sharing is used, or if an airline does not have an office in the country of origin When a ticket is issued for an Interline itinerary, one of the airlines on that itinerary is chosen by the route provider as the airline , commonly referred to as the “Plateing Carrier.” The coating provider collects the entire tariff from the customer, either through its own distribution channels (e.g.B. website or ticketing office), or through travel agencies. Travel agencies transfer fares and taxes collected through The De Reporting Corporation (ARC) to the airline in the United States or the billing and billing plan (BSP) to the rest of the world. The airline that actually carried the passenger (the exporting airline) sends an invoice to the airline that issues and places, usually through the IATA clearing house, to recover its share of the ticket price and taxes. The airline linked to the operation is responsible for the transfer of passenger taxes to the various governments and airports. Some taxes are based on sales (U.S. taxes) and are transferred by the issuing airline. There is a great deal of competition in the aviation sector over ticket sales strategies (also known as “seat reservation”) (revenue management, variable prices and geo-marketing). Consumer organizations and national trade ministries are critical of code sharing because it is supposed to cause confusion and transparency for passengers.  Today, there are so many different types of agreements in the aviation sector. While the exact terms vary with each partnership, I think the simplest way to summarize it is that an interline agreement is like a friendship, a codeshare agreement is like an engagement, a joint venture is like a wedding, and an alliance is like a big family to do with any kind of thing.
Until now, only major network operators such as United Airlines and Lufthansa had electronic ticket interconnection agreements, but IATA`s mandate to remove paper tickets at the end of 2007 changed this situation by requiring smaller airlines to introduce electronic tickets. Most online travel agencies only indicate itineraries that can be booked on one of their reservation systems. However, Orbitz sometimes displays inviolable interline routes. Examples have been found so far on routes to Mexico, which involve the absence of Aero California, or can currently be found on routes to Indonesia with Lion Air. These are displayed on Orbitz as a “contact airline to buy.” While this gives the biggest types of agreements, it seems that they have been much emphasized lately. The special agreement is a special example of an interline agreement that defines precisely the distribution of fees and the billing of ticket costs between air carriers.