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.

Things are getting real. China recently returned three 737 MAX jets from the Zhoushan completion center to Seattle, according to the Air Current.

After the Chinese government reportedly told domestic airlines not to purchase new planes from Boeing, one jet had to be returned to the U.S. from a facility near Shanghai.