If a codeshare contract is like Dating, then a joint venture is like getting married. A joint venture agreement is a massive business decision that usually requires full government approval. When airlines create a joint venture, they coordinate prices and schedules and have an agreement on revenue sharing. Airlines participating in airline alliances such as Star Alliance, SkyTeam or oneworld almost always have interline agreements. But direct competitors can also benefit from Interline agreements. Important: airline agreements should not be reciprocal. An Interline agreement, also known as interlining, Interline Billeting or Interline-Reservation, is an agreement between two or more airlines to treat passengers when their itinerary involves travel with several airlines. This means that they undertake to ship their luggage to their final destination and check them in for their destination. A codeshare flight is different from an Interline flight, because a codeshare flight is the entire flight, while an interline is a flight within a larger route. 2.
To verify the interline agreement between two airlines, please indicate: TGAD-YY/ZZ (where YY is the validating carrier and ZZ is the second largest airline). @Hung Nguyen: Just a word of caution. Although QR has an interline agreement with the UN, most of these agreements only apply if you are travelling with a ticket, but not with separate tickets. There may be exceptions, but I don`t expect to check luggage for separate tickets. This is a commercial agreement between two airlines in which one airline can sell the segments of the other, and each airline retains its own code, which allows you to easily identify the exporting airline. As a general rule, even U.S. airlines that do not have a partnership with each other have an interconnection agreement. A few years ago Delta decided to disable an interline agreement with American, I think because they found that American more passengers on them during irregular operations than vice versa. Code actions are essentially joint marketing agreements between airlines that allow an airline to place its own flight code on flights (piloted) by another airline and sell tickets as if those flights were theirs.
There are many (and some consider too much) code actions that work today. When code actions are involved, the airline that places its code on the flight is designated as a marketing company, and the airline that actually performs the flight is designated as the exporting airline. There are actually two types of code sharing. The first (and most people don`t notice much) is regional contract flights. Here, the airline that makes the flight does so under a contract for a major airline and does not sell its own tickets. You see it a lot in the United States, where major airlines assign flights and market them with the American Eagle, Delta Connection and United Express brands.