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Equipment class in airline booking system

 
Karam
Greenhorn
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My business domain model for airline booking system shows a Flight class associated with an Equipment class which inturn is associated with multiple Seat classes. Can any one please explain what is the business significance of 'Equipment'.
 
Paul Michael
Ranch Hand
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If you think about real flights, multiple flights like FF123, FF456 for example can be associated to the same Airplane (Equipment) but with different schedules.
 
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