In early 2014, the company planned to promote the project with an exhibit at the 2014 EAA AirVenture Oshkosh airshow.[5] Spike then expected to launch the plane by December 2018.[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.[7] In September 2018, Spike intended to fly the S-512 by early 2021 and start deliveries in 2023.[8] In June 2021, Spike was reported to still be developing an 18-seat version.[9]