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8 airporT size As shown in Figure 3, the U.S. respondents represented the following kinds of airports: 9 large hubâ¢ 4 medium hubâ¢ 2 small hubâ¢ 1 non-hub.â¢ CHAPTER THREE sUrVeY response Of the 52 airports surveyed, 25 responses were received, rep- resenting a 48% response rate. (For a list of the 25 respon- dents, see Appendix C.) sUrVeY respondenTs The 25 persons who responded to the survey are referred to as survey respondents throughout this report. Any statistics 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 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. FigURE 2 geographic location of the 25 survey respondents.