Boranbayev , S. и Assanbek , G. 2021. COST CLASSIFICATION AND ANALYSIS OF CONSUMER DEMAND TO OPTIMIZE AIR TRANSPORTATION AND ENSURE THE ECONOMIC STABILITY OF KAZAKHSTAN AIRLINES IN THE FACE OF PANDEMICS . EurasianUnionScientists. 5, 1(82) (фев. 2021), 21-24. DOI:https://doi.org/10.31618/ESU.2413-9335.2021.5.82.1237.