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10 All 15 airports completed the follow-up electronic survey in July and August 2013, a 100% participa- tion rate. (Appendix C lists participating airports.) The answers were self-reported, and no indepen- dent verification of the answers was undertaken. Owing to the sample size, responses are shown by the number of airports that responded and not by percentages. The survey attempted to include airports that are generally representative of the airport industry. However, 12 of the 15 airports that agreed to participate in the study are classified as large hub by the U.S. DOT FAA. The remaining three are classified as medium hub. No small hub airports were included because the only small hub identified for the survey declined to participate. Geographi- cally, the airports are spread throughout the United States and Canada, as shown in Figure 2. chapter four SURVEY RESPONDENTS FIGURE 2 Map of survey.
