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125 The following subject areas would benefit from additional research: â¢ In situ measurement of daytime STI tied to passenger experiences at those tested locations. This kind of test would require coordination and cooperation with airports to a deep level that requires time, access and security logistics. Such coordination and cooperation were not available for this project. Individual airports might choose to conduct such a study as part of their own data collection to develop priorities for renovation of an existing terminal. â¢ The pilot passenger study indicated that experienced passengers at one major U.S. airport tended to tune out PA messages; this is the opposite of the top-down processing model that expects experienced passengers will actively seek information. Additional studies would be useful to determine whether this behavior is specific to certain kinds of experienced passen- gers (e.g., frequent domestic business travelers), generally true across the United States, or only specific to this airport or this region. C h a p t e r 1 3 Future Research