All tourists including Indians require ILP Inner Line Permit which can be acquired from any of the AP Houses situated in New Delhi, Kolkata and Guwahati. The ILP is provided for each of the sectors 1. Bomdila, Dirang, Tawang; 2. Itanagar, Ziro; 3. Namdapha, Changlang. One can get the ILP for any one of the above sectors.
If you are visiting Bomdila sector, then the easiest way to reach there is by road from Tezpur Assam. The nearest airport is Guwahati. One can then go to Tezpur by state transport buses. From Tezpur, shared vehicles are available every morning from 5:30 am. Make sure you book a nice seat with a reputed travel agency. Dont forget to request your driver to halt at Sela pass. Its covered with snow during winter seasons with a nice picturesque view. Although the roads are good & maintained by Border Road Organization BRO, but there are land slides in the rainy season.
If you are visiting Namdapha, then the nearest airport will be Dibrugarh Assam. There are no direct flights to Itanagar and the nearest airport is Tezpur. There is a helicopter service available from Gauhati to various destinations like Pasighat and Tawang in Arunachal Pradesh. The service is operated weather permitting. The fares are reasonably priced.There are no public taxis operating at the Helipad in Tawang.Lest you want to trek from the Helipad to Tawang town make prior arrangments for road transport before boarding the flight.