Abstract: The quantities of common emissions are investigated for a specific type of commercial aircraft. Actual flight data and ICAO emissions data are used. All flight phases are considered, including landing and takeoff phases. The investigation is carried out for the domestic flights only and considers relevant parameters, such as engine type, flight phase and ground or air operation of the flight. The findings suggest that the quantities of emissions of unburned hydrocarbon (HC) and carbon monoxide (CO) during the descent phase can exceed those for the taxi phases and the idle operation of the engines, depending on the approach procedure. The main source of NOx is usually the climb phase. The effect of the duration of taxi phase on the production of HC and CO emissions is discussed.