A Boeing jet that arrived at a completion plant near Shanghai last month appeared to be returning to Seattle, flight tracking data showed on Friday, in a sign that at least one Chinese airline could be halting deliveries due to U.

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

Boeing Co. has found itself at the center of the raging trade war between the U.S. and China, with the latter reportedly instructing its airlines to halt deliveries of the U.S.-made jets.