One thing it looks like your not seeing file extensions. If you go to View Tab, you should see a box that says File Name Extensions. You should check this box.
I have these 3 files for airplane:
airplane.s3d 2,563 KB
airplane_chr.s3d 2,063 KB
airplane_char.txt 1KB (think this file is from the patch)
I think you are missing files, and /or they seem way too small. The files in your first post almost look like they are map files.
I'm not sure if you have a clean copy of ROF2 laying around but I'd check that to see what airplane files are in there. If not you can download the ROF2 client from here: http://wiki.ezserver.online/Getting_Started. In there is a link to download a P2P client that will get you the full Rof2 client which will have the correct airplane files
Takatok
I think I will try that, gonna download it again and copy and paste airplane files, thanks Takatok.
Edit: It worked, thanks Takatok you rock!