WASHINGTON, June 15 (Reuters) - The United States and the European Union agreed to be transparent about any government financing for future aircraft programs and it should be granted on market terms comparable to those offered by private lenders, senior U.S. trade officials said on Tuesday.

"In order to make this work, you need to have frank information-sharing, and you need to have it upfront," one of the officials told reporters after the United States and the EU agreed a five-year truce in a 17-year tariff war over government aid to U.S. planemaker Boeing Co and Europe's Airbus .

The official said the two sides had not set a benchmark for such "market terms," and did not view that as appropriate without knowing future conditions or details of specific projects.

(Reporting by Andrea Shalal Editing by Chris Reese)