If two airlines enter into an interline agreement, that is the most fundamental form of partnership you will find. For the most part, it allows passengers to book by itineraries with fewer problems with several airlines than to book them individually. If two airlines have an interline agreement, they usually take care of check-in and baggage for passengers on the other side. This means that travellers must check in only once for all flights on the itinerary and that their luggage will be delivered from the first airline to the second, without having to pick them up and hand them over manually. For participating airlines, this type of agreement can attract more passengers because it provides easy access to destinations that are not served by the original airline. Emirates recently signed an Interline agreement with Mexico`s Interjet, which allows passengers on their new flights in Mexico City to continue flying other destinations without having to re-examine themselves or their luggage. Closer partnerships include more exchanges, cooperation and more strategic measures between the airlines involved. These include code-sharing and joint ventures. Codeshare agreements focus on aircraft planning and exchange. A codeshare customer can purchase a ticket from one airline, but travel with another airline if both have accepted the relationship. Customers looking for flights with codeshare agreements have a greater choice of flights, as the ticket can be used interchangeably on both airlines, subject to fare rules and stock availability.
As tickets are interchangeable, airlines with codeshare agreements also have an interline agreement. Codeshare agreements typically offer miles per mile for the client`s program of choice. For example, one of the last codeshares announced is between Lufthansa and Vistara. Lufthansa is heading to Delhi, but has no network inside India. Thanks to this codeshare, passengers from any Lufthansa destination can book in a number of new cities in India, including Ahmedabad, Bengaluru, Goa, Hyderabad, Kochi and Pune. This is an evolution of an earlier interconnection agreement between the two airlines, which implies a deeper relationship.