This might be trivial, but I would appreciate some guidance here. 

XPlane runs on Windows and also on the iOS operating system, on a Mac PC. I wonder if the add-ons developed for X-Plane also run on the same OS...Many?....some?... none?

ios version is different from the windows, linux and os x versions... the ios version doesnt have addons ...

ios version is different from the windows, linux and os x versions... the ios version doesnt have addons ...

Do the add-ons developed for X-Plane run on a Mac PC?

yes, most are developed simultaneously for win and mac, linux usually lag behind. Most add ons are independent on the operating system and work fine on all 3

yes, most are developed simultaneously for win and mac, linux usually lag behind. Most add ons are independent on the operating system and work fine on all 3

If most (preferably all) the add-ons for X-Plane run in Mac, then we really have a shot with X-Plane becoming the preferred next-gen F-Sim platform. This is good news.

One of the huge long-term problems of FSX is Windows itself;  who knows for how long would Win-7 be around and there are things that don't work well well with Win8... much less would work with Win9 and beyond...