The paper analyzes the specifics of the impact of air transport services on the environment and provides methodology to solve emerging problems. This article is dedicated to the research of a relevance to upgrade the fleet for running cost-effective business. The main negative ecological influences of the aviation industry operation are noise, electromagnetic radiation, dangerous chemical substances emissions including carbonic acid, harm to animals, plant organisms and adjacent territories, waste production leading to climatic fluctuations, nature destruction and health problems, economic collapses. In addition, aviation sector itself will be affected by its disastrous actions – the main appearing problem can be loss of optimality in carrying out air transport service providers’ activity. The performed researches allowed to find out new ways of air transport disastrous impact shortage. According to the research results, there were determined positive direction for the environment modifications in the airline industry activity – updated assessment method in the form of mathematical model of aircraft fleet usage, which will help to decrease the emissions of old aircraft. Mathematical model of aircraft replacement in the most optimal period of time allowing achieve ecologically safer and cost-effective carriage has been developed.