A Boeing jet earmarked for China was returning to the United States on Friday, flight tracking data showed, as the planemaker's flagship delivery plant outside Shanghai was drawn into a deepening tariff war between Beijing and Washington.

China is going after Boeing, America’s biggest exporter, in its trade war with the U.S. Beijing has told Chinese airlines not to place new orders for Boeing jets and is requiring carriers to seek approval before taking delivery of aircraft they have already ordered,