An airline alliance is a cooperative agreement between two or more airlines to share resources, routes and passengers in order to increase efficiency and reduce costs. These alliances allow members to offer seamless travel options for their customers by allowing them to book flights on any of the member airlines using just one ticket, regardless of which airline operates the flight. This means that a passenger can fly from their home country to another destination with just one boarding pass and without having to worry about transferring between different airports or checking in luggage multiple times.
In addition, airline alliances also offer frequent flier programs where passengers can earn miles on any of the member airlines and redeem them for flights, upgrades or other benefits. These alliances also allow members to share aircraft maintenance facilities, lounges, and other resources in order to further reduce costs and improve efficiency.
Overall, airline alliances are a way for airlines to work together to offer better service and more options to their customers while reducing costs and improving efficiency.