Aviation industry growth has increased continuously over the years. Air transport demand continues to increase due to the reliability, time saving and efficiency. Aviation industry has impact on environment as a source of pollutant emissions. The estimation of pollutant emissions at taxi/idle, approach, climb out and take off of Carbon dioxide (CO2) and Nitrogen dioxide (NOx) at Juanda International Airport Indonesia was calculated using Advanced ICAO landing and take-off (LTO) cycle method. The CO2 emissions were 23.02 tons, 10.52 tons, 17.27 tons and 6.73 tons during taxi/idle, approach, climb out, take off respectively while NOx emissions were 0.03 tons, 0.03 tons, 0.12 tons and 0.06 tons for taxi/idle, approach, climb out and take-off respectively. Based on the results of the discussion it can be concluded that pollutant emissions and fuel consumption are positively related to amount of flight operation. The aircraft emissions affect the air quality around the vicinity of airport and lead to climate change.

Airport Management needs data on Passenger Volume. Passenger Volume varies annually, monthly, weekly, daily, and hourly. A different aspect of Airport Management needs different data on Pasengger Volume Variation. Each airport has its Variation Characteristics. Kilimanjaro International Airport is a unique airport, as it is located close to a Mountain Kilimanjaro. Knowing it's Passenger Volume Variation is important. Three Variations have been observed, the monthly, the weekly, and the hourly. The monthly variation shows that the high season happens from July to October. Based on three months of data, the weekly variation shows the inconsistency of the variation pattern. The weekly index of variation could not be developed. While the daily variation shows that high daily volume exists from Friday to Sunday.