The Boeing aircraft, initially designated for a Chinese carrier, had to be sent back to the Boeing manufacturing center in the United States. This action was a direct result of the retaliatory tariffs imposed by President Trump as a component of his trade policy.

The 737 MAX, which was meant for China’s Xiamen Airlines, landed at Seattle’s Boeing Field, according to a Reuters witness. It was painted with Xiamen livery.

The jet, which made refueling stops in Guam and Hawaii on its 5,000-mile return journey, was one of several 737 MAX planes waiting at Boeing’s Zhoushan completion center for final work and delivery to a Chinese carrier.

Trump this month raised baseline tariffs on Chinese imports to 145%. In retaliation, China has imposed a 125% tariff on US goods. A Chinese airline taking delivery of a Boeing jet could be crippled by the tariffs, given that a new 737 MAX has a market value of around $55 million, according to IBA, an aviation consultancy.

It is not clear which party made the decision for the aircraft to return to the US. Boeing did not immediately respond to request for comment. Xiamen did not respond to request for comment.

The return of the 737 MAX, Boeing’s best-selling model, is the latest sign of disruption to new aircraft deliveries from a breakdown in the aerospace industry’s decades-old duty-free status.

The tariff war and apparent U-turn over deliveries comes as Boeing has been recovering from an almost five-year import freeze on 737 MAX jets and a previous round of trade tensions.

Confusion over changing tariffs could leave many aircraft deliveries in limbo, with some airline CEOs saying they would defer delivery of planes rather than pay duties, analysts say.