HELLO EVERYBODY!! After much fruitless searching for a mod which would let us fly in Tekkit SMP, I started experimenting with known good mods for regular minecraft and I FOUND A SOLUTION which does not involve a jetpack with limited fuel! The CJB Mod pack if just installed normally does not work, and causes minecraft to crash with a grey screen listing the plugins; however, the CJB mod doesn't modify files that Tekkit needs persay, it's just conflicting with one of the mods that come with Tekkit. It will work, it just needs further configuration. I got it to work, and here's how I did it: First, you need to install Player API http://www.minecraftforum.net/topic/738498-125api-player-api/ for whatever Tekkit release you're using; for instance, if you're using the v3 dev build, (minecraft 1.2.5), use the most recent Player API, but if you're using the recommended Tekkit release, (minecraft 1.1), you need to use the Player API 1.1 release. Once you have Player API installed, it's time to install CJB. Again, use the most recent CJB release if you're using the dev release of Tekkit, or the CJB 1.1 release if you're using the recommended release of Tekkit. (Just do a google search for CJB 1.2.5 or CJB 1.1 to find the proper download) The install proceeds like normal, but then once you've installed, before you play the client you need to delete two of the mod files as they conflict with another mod that comes with Tekkit. The two mod files you need to delete from the ./tekkit/mods folder are: - CJB_ITEMS.zip - CJB_ITEMSPAWNER.zip Also, don't bother installing the x-ray plugin in minecraft.jar, it's broken; I haven't figured out a way around this one yet; Hope this helps, and have a great day, ya? -Garenthino MOD EDIT: Don't do that. P.S.: If anyone figures out a way to get the x-ray plugin to work, or finds a different x-ray plugin that works in conjunction with Tekkit + CJB, please reply to this thread and let me know!