To solve problems of multicriteria optimization, and in particular, constructing the Pareto front under dynamically changing external and internal conditions, an analysis of changes in these conditions, the reasons for their occurrence and trends was carried out. For internal parameters that deteriorate over time, which can be interpreted as degradation, the physical causes of its occurrence are considered. The processes that arise when an aircraft moves under icing conditions are considered. The aircraft parameters degradation models developed on the basis of the analyzes were used to determine the dynamically changing parameters of the aircraft. The influence of changing parameters on the change in the Pareto front was assessed.