US Trade Representative Jamieson Greer warned the European Union on Monday that a record $3.4 billion loan from the European Investment Bank to Airbus threatens the fragile transatlantic truce on aircraft financing.

Greer stated that his office has received no details on the June loan despite repeated requests. He noted that Boeing had urged the US government in July to seek greater transparency on the financing, which speculation suggested might support development of a new Airbus model.

"I had sincerely hoped that trade-distorting European subsidies to Airbus were a thing of the past," Greer said in his statement. "For decades, France, Germany, and Spain have aggressively supported Airbus, their national champion aircraft manufacturer, to gain an unfair advantage over US aerospace workers and businesses."

The warning revives a long-running dispute between the US and EU over subsidies to Boeing and Airbus. A 2021 agreement paused retaliatory tariffs after World Trade Organization rulings, with both sides committing to market-based financing for large civil aircraft. The truce was extended in July as part of a broader US-EU trade arrangement.

Greer emphasized that the lack of information injects uncertainty into the aerospace sector and risks violating the terms of the hard-won deal. The European Investment Bank described the financing as its largest ever to Airbus, aimed at research, development, and innovation.

Airbus called the loan a standard corporate financing facility similar to prior commercial arrangements and said it would share details. An EU spokesperson maintained that the financing complies fully with the US-EU agreement.

The development comes amid ongoing efforts to stabilize US-EU trade relations under the current administration. Boeing did not immediately comment on Greer's statement.