An airlines company having different departments for frequent travelers and occasional travelers illustrates departmentalization.

Customer departmentalization

Explanation:

 The customer departmentalization is the one of the type of department in which we perform various types of activities by interacting with the various types of specific consumers in an organization.

 According to the given question, the airline company is contain different types of departments for the two different categories such as occasional travelers and the frequent travelers and this illustrate the customer departmentalization concept.  

The customer departmentalization is basically refers to the specific customer in the department in an organizational structure which has the common set of role and also function.  

 Therefore, Customer departmentalization is the correct answer.

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