"...a potential order of up to four C919 planes... Only nine C919s are currently in service since they started commercial operation in May 2023, all with Chinese airlines."
https://www.reuters.com/business/aerospace-defense/brazilian...
Also, Brazil has agreed to provide consultation and technology sharing between Embraer and Comac. And Embraer is highly competent, with aircraft used in the western world widely, so they’ll help with a lot of the real world issues. This is happening now because of BRICS momentum and Lula (friendly with Xi due to some common ideology). But I think whatever China gains from this new partnership will remain even once it ends. Eventually they’ll make the engines and avionics natively too, it’s only a matter of time.
Meanwhile Boeing has almost no innovation due to a mix of financially focused management, union labor culture, and a brain drain over the last 25 years. They’re not going to increase their lead anytime soon, which means the gap can only reduce.
That jet has lots of sales, and half ownership with production rights would be fantastic for COMAC.