Echelon

Echelon is a combat flight sim set in 2351 where you're a Federation pilot defending against alien attacks. You'll fly over 100 different vehicles—helicopters, fixed-wing aircraft, and hovercraft—each handling distinctly. The game offers 30+ missions that require switching between craft types and choosing from 20+ weapons depending on the threat. Combat spans multiple planetary environments across the solar system. Missions blend dogfighting with ground-target objectives, and you'll need to match your loadout and vehicle choice to each scenario. It's built for players who like variety in their vehicle sims and don't mind older 3D presentation from the early 2000s.