So this afternoon I wrote this app for FlightGear. It's meant to be a temporary replacement for the official FlightGear launcher app. It doesn't let you choose many options - in fact, you can only choose aircrafts, airports, and that's it.
But it works. And it's easy. And that's what's important. It even digs up the list of the planes:


You can download it from http://www.mediafire.com/download/a52l89u821c7493/FlightGear+Launcher.app.zip, and I hope somebody is helped by it. Again, it's just for the time when the FlightGear Launcher doesn't support Yosemite, which it probably will in a while.
By the way, if you use and find bugs, please report to me so that I can fix it. Also, please tell me if it gives you errors, because then I can fix it.
Enjoy!