@Quiznos323 has graciously given me permission to continue supporting this mod pack.  As I am not a modeler, I'm supporting it in a maintenance mode, fixing bugs, keeping it working. WARNING There is a bug 1.4.* (and possibly in 1.3.1) which causes a plane with certain parts to immediatly jump to 1000m in height upon launching, and then slowly descend to the runway. It can be fixed by installing the WorldStabilizer mod, available at the following link.  Note that the 1.3.1 version DOES