APPENDIX A1$_{ }$ 𝑬 𝒊𝒊 =  𝟏 𝟏 ,  𝟎𝟎𝟎 ×  𝑵𝑬 𝒊 ×  ෍ൣ𝑳𝑻𝑻 𝒊𝒋 ×  𝑭𝑭 𝒊𝒋 ×  𝑬𝑭 𝒊𝒊𝒋 ൧ 𝒋 Where:  E$_{ij }$= total emissions of pollutant i, expressed in pounds, produced by aircraft type j for one  LTO cycle  NEj = number of engines used on aircraft type j  TIM$_{jk }$= time in mode for mode k, expressed in minutes, for aircraft type j  FF$_{jk }$= fuel flow for mode k, expressed in pounds per minute, for each engine used on aircraft  type j  EF$_{ijk }$ = emission factor for pollutant i, expressed in pounds of pollutant per one thousand  pounds of fuel, in mode k for aircraft type j  i = pollutant type (e.g., NOx, CO, or VOC)  j = aircraft type (e.g., 737-900)  k = mode (i.e., idle, approach, climbout, or takeoff)  Equation A1-1. Emission Calculation for Each Aircraft Type for One LTO  Total aircraft emissions are then estimated by applying  Equation A1-2  ( Emission Calculation  for All Aircraft ), which multiples the aircraft emissions per LTO for a given aircraft type.  Where:  E$_{i }$= total emissions of pollutant i, expressed in pounds, produced by all aircraft operating in  the region of interest  E$_{ij }$= total emissions of pollutant i, expressed in pounds, produced by aircraft type j for one  LTO cycle  LTO$_{j }$ = total number of LTO cycles for aircraft type j (where j covers the range of aircraft  operating in the area) during the inventory period  i = pollutant type (e.g., NOx, CO, or VOC)  j = aircraft type (e.g., 737-900)  Equation A1-2. Emission Calculation for All Aircraft  3$_{ }$