Finally, the argument assumed without justification that background conditions have remained the same at different times. As is the case presented in the argument, only a small fraction of the passengers were unsatisfied with the luggage-handling procedures last year. This means an overwhelming majority of the passengers were pleased with the procedure service. Nevertheless, the author of the argument does not necessarily prove that this phenomenon will inevitably happen in the near future. It is an unwarranted assumption for the simple reason that things rarely remain constant over extended periods of time.

　　In a nutshell, the argument omits several key factors; it is not sound or persuasive. If it involves the items discussed above rather than simply illustrate several numbers in a survey, the argument would have been more thorough and compelling.

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