The building combines steel with roughly 1,800 cubic metres of timber, a design choice meant to lower its environmental impact, according to Japan Airport Terminal, the airport’s operator. Solar panels and specially‑shaped shading columns are expected to cut the facility’s annual energy consumption by more than 30%, NHK reported.

Inside, passengers will find a new lounge, a dedicated children’s area, and a fleet of free self‑driving vehicles that circulate between gates and the main terminal, helping travelers move around more easily.

Because the new wing pushes the security checkpoint farther from the check‑in counters, Japanese airlines announced that baggage for domestic flights must now be checked in at least 30 minutes before departure, up from the previous 20‑minute window. Kumiko Saito, an executive officer of Japan Airlines, said the change means travelers should arrive earlier to avoid delays.

The upgrades arrive as Haneda celebrates its 14th consecutive Skytrax award as the World’s Best Domestic Airport and its 11th year as the cleanest airport worldwide, highlighting the airport’s focus on passenger comfort and sustainability.