Does the mileage credit appear in the class diagram, or is it embedded within the Frequent Flyer system ? Does FFS give mileage credit based on flight number (i.e. sum of flights in itinerary) or by number of miles?
i think the two options are valid, it depends on your asumptions, but if the millage acumulated by a user is important to the system ... do you think is necesary to have a class (or classes) to represent that ? independently from where you get the information of this part of the model ...
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