TY JOUR TI Transition to the PD-8 in the Superjet Program: Economic Consequences for Operation and Deliveries KW fleet operation KW aircraft deliveries KW engine repair KW serial production KW transition period KW economic consequences KW domestic aircraft industry KW SSJ100 KW SJ-100 KW PD-8 JO Journal of Applied Research AU Rodionova, Y.I. AU Soboleva, V.D. AU Ratner, A.V. PY 2026 IS 0 PB ITBO University