 The district headquarters at Anini, a conglomeration of about ten tribal settlements with a population of a couple of thousand in Arunachal Pradesh is the only one of its kind in the world which is totally air-maintained.Pilots operate from the Advance Landing Grounds (ALG) with only one third of the length of a regular runway, having unique and uni-directional approach and take off requirements.This coupled with the vagaries of weather expects superior skills from the pilots and their navigators.