2019 article: "Boom envisions its Overture airliner traveling at Mach 2.2." 2021 article: "a plane that could fly at Mach 1.7"
2019 article: "Its planes could be ready for commercial service in the mid-2020s". 2021 article: "It is targeting the start of passenger service in 2029."
The 2019 article also says that Boom is constructing a 1/3rd scale version of Overture that could be making test flights later in 2019. This article from October 2020 says that the 1/3rd scale vehicle was "rolled out" in 2020 and could be ready for test flights in Q3 2021. https://www.forbes.com/sites/erictegler/2020/10/26/boom-supe...
https://arstechnica.com/science/2019/01/supersonic-passenger...
Some side-by-side comparisons:
2019 article: "Boom envisions its Overture airliner traveling at Mach 2.2." 2021 article: "a plane that could fly at Mach 1.7"
2019 article: "Its planes could be ready for commercial service in the mid-2020s". 2021 article: "It is targeting the start of passenger service in 2029."
The 2019 article also says that Boom is constructing a 1/3rd scale version of Overture that could be making test flights later in 2019. This article from October 2020 says that the 1/3rd scale vehicle was "rolled out" in 2020 and could be ready for test flights in Q3 2021. https://www.forbes.com/sites/erictegler/2020/10/26/boom-supe...