“In the aftermath of the 2016 Kumamoto earthquakes, SoftBank sent communication relay equipment aloft on a balloon.” – Not known until today by Kirk

Major telecoms preparing array of ‘flying base stations’ https://the-japan-news.com/news/article/000726168

ソフトバンク、熊本地震で被災地のSoftBank携帯電話における通信速度制限を4月30日まで撤廃!基地局復旧に加え、気球による無線中継システムを災害に初導入 https://news.livedoor.com/article/image_detail/11426448/?img_id=10238008