The operator of the zeppelin NT in Japan, the NIPPON AIRSHIP CORPORATION is bankrupt. All operations have been terminated, even the website is no longer online. Let’s hope that the zeppelin is back in the sky soon.
Source: http://www.tdb.co.jp/tosan/syosai/3286.html
NIPPON AIRSHIP CORPORATION website: http://www.nac-airship.com/
If you want to learn more about zeppelin mail and zeppelin crash covers, visit the website of the ZEPPELIN STUDY GROUP at http://www.ezep.de/