ブーム・オーバーチュア
“This Startup Is Developing Supersonic Planes for Virgin Group”. Fortune. http://fortune.com/2016/03/23/boom-supersonic-virgin-deal/
↑ “Boom, the startup that wants to build supersonic planes, just signed a massive deal with Virgin”. TechCrunch (Oath Tech Network). (2016年3月23日). https://techcrunch.com/2016/03/23/boom-the-startup-that-wants-to-build-supersonic-planes-just-signed-a-massive-deal-with-virgin/
1 2 Tom Batchelor (2018年7月23日). “Supersonic jets linking 'hundreds' of cities with ultra-fast flights will be 'affordable for all', plane maker insists.”. The Independent. https://www.independent.co.uk/travel/news-and-advice/supersonic-jet-travel-plane-available-public-cheap-concorde-blake-scholl-a8453706.