You are analysis are based on past performance of cheap credit from Western leases, mass production at multiple production site, low input prices, globalized engineering. All those factors are going to be reversed very fast. Airplanes from Airbus/Boeing will become so expensive that only few percentage of population will afford it.
that reality is now hitting the airlines.
Russia has its own unique approaches to aviation and they are implementing it consistently both on older generation upgrades Tu-214/IL96 and newer planes SSJ/MS21 simultaneously that no one other country can replicate. They developed planes that can deal with extreme weather and extreme elevations from the beginning.