Ok so I've been playing around with this for the last week or so mainly because I just bought one of these:

and needed to get back enough helicopter skills to not smash it straight away.
RealFlight G4 is the latest version of one of the better RC sims out there and it occurs to me that quite a few BETEOers would probably like it if they ever had a go. I reckon anyone who has ever been into flight sims would really enjoy it even if they haven't the slightest interest in or inclination to ever want to fly an RC plane or helicopter. There's not a lot to do as such other than fly around but mastering doing just that has an incredibly addictive difficulty curve to it. I'm sure that there's actually a really good and fairly unique game in there somewhere. I know it's sort of been tried before with some helicopter game back on the PS1 but it was a pretty poor effort really.
It isn't cheap if you go out and buy it.
But it is well worth seeking out. If you didn't buy the version that comes with one then you'll need some sort of dual analogue controller, ideally a proper RC transmitter type one that you can get off ebay for about a tenner but failing that any would do though, for planes a normal joystick would work too.
There are other sims out there, even some free ones that are pretty good but have rather poor physics and pretty shoddy graphics:
http://n.ethz.ch/student/mmoeller/fms/index_e.htmlRealFlight on the other hand is actually a pretty tidy piece of software and visually impressive for such a niche product:
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There's also a community made version of pretty much every conceivable type of plane available free for download.
Anyway I think it's much fun, but I might just be exceptionally weird.