The aim of this article is to take into account specifications of the airport area in LTO test, when impact of the air transport at the airport- proximate area is analysed. The LTO test doesn’t con-sider the specifications of e.g. airport manoeuvring area and length of taxiways. The LTO test calculation methodology requires knowledge of aircraft engine parameters, such as thrust, spe-cific fuel consumption and emission values indexes. Based on the data contained in the Engine Emissions Database (ICAO), the parameters of the LTO test can be clearly determined. The main analysis element was to conduct a taxiing simulation using the CKAS MotionSim5 Flight Simu-lator in order to indicate the operational taxiing time at individual polish airports. Statistically significant differences were found between the emissions of selected exhaust gas components in the regulation LTO test and the operational LTO test. Analyzes were carried out in relation to three different propulsions that are most often used by carriers serving the largest number of passengers in Poland.