TY JOUR TI Economic Assessment of the Impact of LMS-901 Baikal Light Multipurpose Aircraft Certification Delay on the Regional Aviation Fleet Renewal Programme KW LMS-901 Baikal KW regional aviation KW small aviation KW certification KW aircraft life cycle KW regional flights subsidization KW import substitution KW risk adjustment KW net present value KW An-2 fleet JO Journal of Applied Research AU Rodionova, Y.I. AU Yudin, M.M. AU Smirnov, A.D. PY 2026 IS 0 PB ITBO University