TY JOUR TI Using an automated fuel transfer control system to improve flight efficiency using the Boeing 747-400 aircraft as an example KW automated control system KW fuel transfer KW center of gravity KW flight economy KW Boeing 747-400 KW mathematical modeling KW flight dynamics JO Journal of Applied Research AU Sokolov, O.A. AU Silenko, A.S. AU Malyutin, A.M. PY 2026 IS PB ITBO University