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AIRPORT MASTER PLAN <br /> <br />aircraft that will operate at the airport in the future. It also allows for better <br />planning of future facilities and airside needs for the airport and the ability to justify <br />such facilities when the market demands such construction. Most turboprop and <br />jet aircraft currently using San Marcos fall into the B-II, C-I or C-II category. Since <br />2014, San Marcos has had a few operations in the C-III and D-I categories. The C-III <br />activity is related primarily some to some infrequent DC-9 operations at the airport. <br />The D-I activity is related to the utilization of some older Learjet models (e.g. <br />models 35/36) with smaller wing surfaces and, consequently, higher approach <br />speeds. <br />Based on this information, the following ratios were developed for the forecasted <br />fleet mix: <br /> Aircraft Approach Category (AAC): Aircraft Design Group (ADG): <br />o A 88.75% o Group I 90.65% <br />o B 10.00% o Group II 9.00% <br />o C/D 1.0% o Group III .10% <br /> o Group IV Less than .01% <br /> o Helicopter .25% <br />These ratios are expected to change during the forecast period based on national <br />trends and expected changes in the -based aircraft fleet mix. Consequently, <br />progressively to these <br />baseline ratios during each forecast interval. Acceleration factors were applied to <br />the AAC B and C/D categories as well as the ADG II, III, and helicopter categories. A <br />deceleration factor was applied to the AAC A and ADG I categories. <br />Table 3-13 displays this breakdown for the 20-year planning effort. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Activity Forecasts Chapter Page 29 of 36 <br />October 2020 <br /> <br />