Lost case, sadly. I have searched for X-Plane Helicopter and Extreme (and the one that adds waterplanes, and the one that allow you to try formation flying...) for ages, without any results. I suspect, that they were released for Androcrap and ISh|t only, with planned release for WebOS halted.

.apk files for them could be used via ApkEnv as they're same OpenGLES C programs for all platforms, but it would require some guru to write so-called support module for it (see ApkEnv module development thread). Other way is to install whole Nitroid to SD card and run them natively, which still seems silly, just to run those 2 games (but I may end up doing it, one day - just because X-Planes are so awesome).

As for X-Plane planner, I'm 101% it wasn't even planned to be released for WebOS.

/Estel