The United States
National Aeronautical Space Agency (NASA) and Japanese Aerospace Exploration Agency (JAXA) are tying up to develop a fuel-efficient, low-noise, supersonic jet that will fill space vacated in 2003 by the Anglo-French Concorde.
JAXA had demonstrated a small supersonic aircraft last year prompting the US to seek out a Japanese collaboration. A consortium of Japanese aerospace vendors and Boeing will partake in this deal.
The deal is worth several billion US dollars.