If you install nothing else:

These are payware‑level free aircraft:

remains a favorite for many flight sim enthusiasts, and one of its biggest perks is the massive library of high-quality freeware. You don't need a massive budget to turn the default simulator into a professional-grade experience. Here is a curated guide to the must-have free add-ons to enhance your flight deck. ✈️ Essential Aircraft Zibo 737-800 Modified