US Transportation Secretary Sean Duffy said he wanted a return to a tariff-free agreement for civil aviation.

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Airbus has struck a deal with Vietnamese budget airline Vietjet for up to 150 single-aisle jets at the Paris Air Show as the aviation industry’s hopes to return to a tariff-free trade agreement were given a boost by United States Transportation Secretary Sean Duffy.

The French planemaker announced the deal on Tuesday.

Airbus is the main supplier of jets to Vietnam, accounting for 86 percent of the planes currently operated by Vietnamese airlines. The export-dependent Southeast Asian country is under pressure from Washington to buy more US goods.