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These probably aren’t good by any means you’re looking for, but I’ll add them as curiosities.

Picowings – a cute little flight simulator for the PICO-8 fantasy console.

The desktop version of Google Earth Pro has a built-in flight simulator with either F-16 or SR22, though I have yet to try it.

There are some war-themed ones, so realistic MMORPGs definitely exist. Sword Art Online however is fictional in the sense it’s not an actual released game. It’s made up as the central element of a light novel series of the same title, later adapted into a popular anime.

It’s all fun and games, until you need a warranty disclaimer.