The game engine, yes. The game itself? Not a chance.
I think you are seriously underestimating the complexity of a game. This would be possible, but as a major open-source project.
Replacing the game engine would be a big undertaking, but it's doable. People did just that with Frontier: First Encounters (http://www.frontierastro.co.uk/Hires/glffe.html). The game binaries is run as is, but modified to hook into the new engine.
Using FlightGear is not the same thing. It would be difficult, if not impossible, to get the same feel of the original game. However, this would be perfect for a remake, where the original experience is not expected.
I think you are seriously underestimating the complexity of a game. This would be possible, but as a major open-source project.
Replacing the game engine would be a big undertaking, but it's doable. People did just that with Frontier: First Encounters (http://www.frontierastro.co.uk/Hires/glffe.html). The game binaries is run as is, but modified to hook into the new engine.
Using FlightGear is not the same thing. It would be difficult, if not impossible, to get the same feel of the original game. However, this would be perfect for a remake, where the original experience is not expected.