Checking in your flights can often confuse passengers because they don`t know which airline should be used for check-in. However, the answer is usually the carrier operator. It`s the real airline you`re going to fly with, not the one you bought with. For example, in the following example in the FAQs, you would check in both flights with British Airways. A codeshare agreement is the next step in cooperation between airlines. This is when two airlines realize that there is value in cooperation, and they decide that they want to place their “codes” on each other`s flights. As a general rule, the main advantage is that it allows airlines to partner in a codeshare agreement. When a ticket is issued for an Interline itinerary, one of the airlines on that route is chosen by the ticket provider as the transmitting airline, commonly known as the Plating 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. The interline, also known as interline and interline ticketing, is a voluntary commercial agreement between different airlines to treat passengers travelling on routes requiring several flights with several airlines.  Such agreements allow passengers to switch from one flight with one airline to another airline flight without having to pick up their baggage or re-register it. Airlines can also promise a free booking change if the service is interrupted due to a delay.