Very hard to break into the boeing/airbus duopoly. All the supporting infrastructure: maintenance engineers, parts, pilot training, etc... is all heavily invest

Very hard to break into the boeing/airbus duopoly. All the supporting infrastructure: maintenance engineers, parts, pilot training, etc... is all heavily invested in those two. An airline would have to make a substantial investment to transition off, and their margins are already pretty thin. Not to mention most of them have large backlogs of orders for planes that haven't even been built yet. As a manufacturer would need to heavily subsidize the transition in order to make it work. Would take a tremendous amount of capital and many years to pull it off. The juice is not worth the squeeze.