A sequence diagram for an airline reservation system quantitatively describes how tasks are performed and the interactions between software applications in designing software applications. It details the system components, the life-cycle of the reservation process and how it links with other processes. It also helps to identify possible errors in the system. It can illustrate how the airline reservation system works, which is beneficial for software development, testing, and maintenance. In addition, it provides a good basis for documenting a system's functionality.
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