[1] It would allow long flights for business and private travelers, such as from New York City to London, to take only three to four hours instead of six to seven.

Instead, it will be equipped with cameras sending external views to thin, curved displays lining the interior walls of the fuselage.

[4] In early 2014, the company planned to promote the project with an exhibit at the 2014 EAA AirVenture Oshkosh airshow.

[4] In January 2017, a subsonic scale prototype was planned to fly in summer 2017 to demonstrate low-speed aerodynamic flight characteristics, before a series of larger prototypes and a supersonic demonstrator by the end of 2018, Spike intended to certify the S-512 by 2023.

[6] By Spring 2018, Spike studied a 40- to 50-seat variant for the 13 million passengers interested in supersonic transport projected by 2025.