a) Fair enough. But I reserve some doubts it will be that easy. If it gets to the point that China bans Boeing, I'm convinced many EU companies would also be in the firing line of US sanction regulators and China.

b) Cormac cannot even produce jet engines after 25+ years of state backed R&D.

"China does not have the capacity to build a jet engine yet alone a commercial plane in service."

My point was that they are building a commercial plane (not with Chinese fans yet), as your usage of "yet alone" expressed some kind of dependency or sequence, at least to my non native speaking ears.