Games like RFS: Real Flight Simulator

If you finished RFS: Real Flight Simulator, the closest matches are Boku ha Koukuu Kanseikan: Airport Hero 3D - Honolulu, Wings Over China: Air Battles of the Flying Tigers, F-16 Aggressor, Su-27 Flanker Mission Disk and Boku wa Koukuu Kanseikan: Airport Hero 3D Haneda with JAL. All 9 share its simulator genre and are ranked by how closely their themes and modes overlap.