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8 Chapter Three Survey Response Of the 52 airports surveyed, 25 responses were received, rep- Airport Size resenting a 48% response rate. (For a list of the 25 respon- dents, see Appendix C.) As shown in Figure 3, the U.S. respondents represented the following kinds of airports: Survey Respondents · 9 large hub · 4 medium hub The 25 persons who responded to the survey are referred to · 2 small hub as survey respondents throughout this report. Any statistics · 1 non-hub. derived from the responses relate to the survey respondent group only, not to the total target audience of 52. Airport Authorities Two of the non-U.S. airport survey respondents repre- sented large airport authori- ties that manage more than one airport. For the purposes of data analysis, we have counted the airport authorities as one airport, although their responses may represent sus- tainability practices at more than one airport. Geographic Location FIGURE 2Geographic location of the 25 survey respondents. The 25 survey responses were from 16 U.S. airports and 9 non-U.S. airports. The U.S. airports were located in vari- ous states and the non-U.S. airports in various regions (see Figure 2). FIGURE 3 Varying airport sizes for 25 U.S. survey respondents.