United Aircraft Corporation

Aside from that, the only major unaligned aircraft series is the Bombardier CRJ regional jet, whose manufacturing rights are in the process of being bought by Mitsubishi.

There's then the Russian United Aircraft Corporation producing a small number of Ilyushin, Tupolev, and Sukhoi jets, and an even smaller number of commercial jets being produced by the Ukrainian Antonov company.

These Russian and Ukrainian aircraft tend to be mostly bought and operated by Russian and Ukrainian airlines, so in terms of global aircraft competition against Boeing and Airbus, there really is none.

It is the textbook duopoly.