It's the usual driver - competition. If a company refuses to accept the IP loss of selling to China surely, it thinks, one of it's competitors will. That compet

It's the usual driver - competition. If a company refuses to accept the IP loss of selling to China surely, it thinks, one of it's competitors will. That competitor will grow rapidly and can then destroy you in the medium term. So better to be the company that goes to China and survives the medium term existential risk, even if it creates a long term existential risk. This actually points to some reasons why this might not apply to aviation: 1. ITAR restrictions on some of the tech necessary. You don't need to worry about your competition going to china if the government is making it hard for both of you to go. 2. Oligopoly. There are few aviation companies, so the "surely one of my competitors" and competition generally is weaker than in other sectors.