Territory is very important for every state in this world. All states will defend their territory even one inch for not losing their territory. Territory, in real, commonly is divided into three parts; Sea, Air, and Land. Indonesia, as one of the state in the world, gives a very serious attention to this issue. Unfortunately, there are some airspace areas that belong to Indonesia but Indonesia cannot get full authorization there. Those areas are above Riau and Natuna Islands. Indonesia has to give Air Traffic Control management above these area to Singapore although juristically those areas belong to Indonesia This writing tries to examine what reasons that become obstacle for Indonesia to fully authorize on those areas. The research method for this writing uses library research and similar research. The research shows some basic reasons why Indonesia is not given full Air Traffic Control management from ICAO as the main institution that takes care about civil aviation like historical reason, technology reason, and institution reason.