hello Nabeel 
i have a small question about the distance calculator in the admin/add route  
if i add a rout you can calculate the correct distance or let it calculate auto 
now my question if i let it calculate it give a number. 
example:eblg-vhhh=6064.249 
now if i let it calculate via a tool i found on the net it give met for the same 2 airports this 
5041.51 ( http://www.airrouting.com/content/TimeDistanceForm.aspx)link to tool 
can you explane the difference