Federal Air Transport Agency, 37 к2, Ленинградский проспект (дублёр), Khoroshyovsky District, Moscow, Central Federal District, 125167, Russia
Irkut Corporation
Rostec announced it 'last Tuesday' in coverage dated 29 Dec 2021 (Tuesday 28 Dec); AvWeb[3] published 30 Dec and Rostec's release was posted 3 Jan 2022, so the exact issue date is not stated by Rostec in the text read.
Rosaviatsia issued the Irkut MC-21-300 type certificate and a design-organisation certificate in late December 2021, four and a half years after the first flight; it covered the Pratt & Whitney-powered version only.