GS4: Realistic Air Combat is described as 'Experience High Fidelity Realism Combat FlightSim on Your Mobile Device delivers realistic flight physics, authentic weapons, and dynamic battlefields—designed for pilots who want depth, realism, and tactical freedom' and is a flight simulator in the games category. There are four games similar to GS4: Realistic Air Combat for a variety of platforms, including Android, iPhone, iPad, Windows and Linux apps. The best GS4: Realistic Air Combat alternative is IL-2 Sturmovik. It's not free, so if you're looking for a free alternative, you could try DCS: World or Armed Air Forces.
IL-2 Sturmovik is a series of World War II combat flight simulator video games originally created by the Russian video game developer Maddox Games under the brand name 1C:Maddox Games, following its association with 1C Company.
Digital Combat Simulator World (DCS World) 2.8 is a free-to-play digital battlefield game.
Armed Air Forces offers all-embracing combat flight simulation experience on mobile devices. Finally you can play PC quality combat game anywhere and anytime you wish.
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