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Air Passenger Surveys 107 requires a coordinated survey approach at all airports. This coordination does not necessar- ily require simultaneous surveys but does require that the survey method and questionnaire are common at each airport, or the results will not be comparable or applicable to the total population. In general, it would be desirable for the different surveys to be performed within a few weeks of one another to minimize differences due to seasonal effects. A common approach is to conduct surveys at each airport over a period of several weeks, surveying at just one of the airports on any given day and scheduling the days at each airport to provide survey coverage of that airport on each day of the week at some point during the survey period. Stratified sampling could be used to ensure a representative sample across airports and sample sizes chosen so that similar levels of accuracy are obtained for each airport, if comparisons are required. 5.7.2 Multi-Terminal Airports Because different terminals in a multi-terminal airport typically serve different airlines, and often different types of traffic (e.g., domestic or international), a survey that is designed to cap- ture the characteristics of the air passenger population at the airport will need to survey passen- gers in every terminal. In this respect a multi-terminal airport is no different from a multi-airport city. The survey design must account for multiple terminals, with consideration given to an appropriate distribution of the survey responses among the terminals over the course of the sur- vey period. The sampling plan must also consider the multi-terminal environment. Interviewers will require time to switch terminals. Switching terminals may require leaving the secure area and re-entering it, which takes time. These factors must be taken into consideration in designing the survey. 5.7.3 Local Terminology In designing survey questions, it should be recognized that words and phrases may have different meanings, or subtle variations of meaning, in different parts of the country. While it is possible to write a questionnaire using local terminology, many of the passengers will be visitors from outside the region and may misinterpret the questions. It is therefore critical that questions be worded using clear terminology understood by all passengers, and additional explanations given if necessary. With intercept interviews, interviewers must be trained so that they fully understand the questions and, if necessary, can restate a question in local terminology. 5.8 Information on Greeters and Well-Wishers A survey sponsor may wish to gather information on greeters and well-wishers as part of an air passenger survey. Greeters and well-wishers account for a significant proportion of all airport access and egress trips, and some use airport facilities. The distinction needs to be made between greeters and well-wishers who come into the airport terminal building to meet arriving passen- gers or see departing passengers off on their trip, and those who come to the airport only to drop off or pick up passengers but do not come into the terminal. The latter are sometimes referred to as "serve passenger" trips. Although greeters and well-wishers cannot access the secure part of the terminal and thus will not be intercepted by surveys in that area, passengers will be able to provide information on the well-wishers who accompanied them to the airport. However, they may not know how long the well-wishers remained at the airport after the passengers went through security or whether the well-wishers made any use of airport services or concessions before leaving.