Your expectations are somewhat unclear.
Virtually any modern PC can run IL-2. I occasionally "play" IL-2 via RDP connection on our SAS Gameserver (which has no GPU, everything is done remotely over the Internet) and achieve a reliable 50 FPS in DirectX mode. Any new PC with a dedicated GPU can run IL-2 in Perfect mode at 60 FPS without any issues, and possibly 50 FPS in 4K. Any laptop will run IL-2 in DirectX mode flawlessly, and any laptop with a dedicated GPU will perform similarly in Perfect mode.
That's the situation for IL-2. Microsoft Flight Simulator is an entirely different challenge. Systems capable of running MSFS 2020 start at around $1,000, with good ones at around $2,000. Laptops cost about twice as much. For MSFS 2024 (release date November 2024), you can add another $1,000 on top.
So, what exactly are you looking for? The price range starts at $300 (for an IL-2 Desktop in DirectX mode) and goes up to $5,000 (for a good laptop for MSFS 2024).
Mike