Narita International Airport (NRT). Or so a lot of people may think, because it was formally called "New Tokyo International Airport", but commonly called "Tokyo Narita". This airport is actually not located in Tokyo, but rather, in next-door Chiba Prefecture, in the city of Narita. The main airport IN Tokyo is Tokyo International Airport, or commonly called Haneda Airport (HND).
Narita Airport (Tokyo) Haneda Airport (Tokyo) Kansai Airport (Osaka) Central Japan Airport (Nagoya) Asahikawa Airport Shin-Chitose Airport (Sapporo) Hakodate Airport Aomori Airport Akita Airport Sendai Airport Fukushima Airport Niigata Airport Toyama Airport Komatsu Airport (Kanazawa) Okayama Airport Hiroshima Airport Yonago Airport Takamatsu Airport Kitakyushu Airport Fukuoka Airport Nagasaki Airport Kumamoto Airport Oita Airport Miyazaki Airport Kagoshima Airport Naha Airport (Okinawa)
All Nippon Airways is Japan's largest airline and its main international hubs are Narita International Airport, outside of Tokyo, as well as Kansai International Airport outside of Osaka. It's main domestic hubs are Tokyo International Airport, Osaka International Airport, Chubu Centrair International Airport, and New Chitose Airport.