I Was on the hl2war forums and someone called jenks said there was a air node tool so like hunterchoppers and that would follow it… If you have this put it on or please make it D:. Its basically a tool gun where you clikc and the nodes follow u. so you noclip away and the dropship etc follows you… click again and it stops 
Nodes are placed in the level at design time and baked into the AI graph then removed.
I don’t think creating nodes at runtime would actually help.
D:…]= dude… dude… duuuuuuuuuuuuuddddddddddddeeeeeeeeee