The tariff turmoil keeps getting worse for America’s largest exporter: Boeing’s vast and fragile supply chain is grappling with the end of its decadeslong duty-free status. Boeing faces retaliatory tariffs from other countries.

China Southern Airlines said it was suspending the sale of 10 used Boeing planes.

Shares of Boeing fell Tuesday following a report that China has halted the delivery of all its jets to airlines in the country as part of the escalating trade war.