fix non existent variables

lib_planes/custom_physics.lua

@@ -24,7 +24,7 @@ function airutils.physics(self)
 	if surface then				-- standing in liquid
         self.isinliquid = true
     end
-    local last_accel = new
+    local last_accel = vector.new()
     if self._last_accel then
         last_accel = vector.new(self._last_accel)
     end

lib_planes/entities.lua

@@ -304,7 +304,7 @@ function airutils.logic(self)
         --special routine for automated plane
         if extern_ent then
             if not extern_ent.on_rightclick then
-                local touch_point = self.initial_properties.collisionbox[2]-0.5
+                local touch_point = (self.initial_properties.collisionbox[2])-0.5
                 local node_bellow = airutils.nodeatpos(airutils.pos_shift(curr_pos,{y=touch_point}))
                 --minetest.chat_send_all(dump(node_bellow.drawtype))
                 if (node_bellow and node_bellow.drawtype ~= 'airlike') then

lib_planes/utilities.lua

@@ -187,7 +187,7 @@ function airutils.attach_pax(self, player, is_copilot)
             return
         end
 
-        t = {}    -- new array
+        local t = {}    -- new array
         for i=1, max_seats - crew do --(the first are for the crew
             t[i] = i
         end
@@ -199,6 +199,7 @@ function airutils.attach_pax(self, player, is_copilot)
         end
 
         --for i = 1,10,1 do
+        local i = 0
         for k,v in ipairs(t) do
             i = t[k] + crew --jump the crew seats
             if self._passengers[i] == nil then