Sequence diagram of Airport Check-in and Sreening System in uml

Sequence diagram describe interactions among classes in terms of an exchange message over time.Time is shown along vertical (y-axis) and objects arrangement along horizontal (x-axis) ,
i.e., the first event will be on left side topmost corner and the last event will be on right side
bottom most corner.

The sequence diagram for Airport Check-In and Security Screening System is shown below.

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