Quite simple really the jetpack only works for op'd players so it works for me and not my friends. I tried oping ithem but even with cheats enabled I got the unknown command message. Seems oping is not allowed in lan games. I tried allowing flight for him by editing his player.dat but when he logs in it resets to 0 and I'm one step shy of decompiling ic2 and fixing it then recompiling it. This has made one of my friends demotivated and has stopped playing. He even stoped making the phase blade because he is adamant it wont work for him even though I know it will he wont listen (I know he's being a baby) I on the other hand have little interest in the jetpack but I want to play with my friends. Edit: I am aware it asn issue with non op'd players as I had this issue on a server in 1.2.5 but that was an easy fix "/op <playername>"