The northeastern part of the country is marked with the presence of difficult hilly and mountainous terrain, dissected relief, large number of rivers, dense forest, heavy rainfall and frequent floods. International frontiers also mark this region. Air transport is the best mode of travel in these areas as airways can negotiate over geographical obstacles and political boundaries with great ease. Roads and railways cannot be properly laid out in such difficult terrain and heavy rainfall and frequent floods disrupt all other modes of transportation. Air transport is the only means of communication under such situations. They can access remote and inaccessible areas in these north-eastern states. They are the fastest and most comfortable means of transport. Domestic airlines have made special provisions to extend air service to the northeastern states at subsidised rates to meet the requirement of the common people. So, the airways are also within the financial reach of the common people in this region. On account of all these factors, airways is the preferred mode of transportation in the north eastern states of India.