日本エアシステム
The district is home to many corporate headquarters. From the 1970s through the mid-1990s Japan Air System (originally Toa Domestic Airlines) was headquartered in the in Toranomon. Air China has its Tokyo offices in the Air China Building in Toranomon. TV Tokyo, Japan Tobacco, Oki Electric Industry, Fuji Fire and Marine Insurance, and Mitsui O.S.K. Lines have their headquarters in Toranomon.