Airbus - a major source of work for aerospace firms in the West Midlands - has asked the UK for funding to develop its new A350 airliner, despite US warnings that the move could trigger a transatlantic trade war with Europe.
The US pulled out of a 1992 bilateral aviation trade agreement last year under which Airbus tapped European governments for a third of development funding for new aircraft in the form of launch aid.
Washington also filed a complaint with the World Trade Organisation as a warning against Airbus again receiving such loans, which it sees as unfair subsidies.
"It would have gone in about five weeks ago," Airbus UK spokesman Howard Berry said of the latest launch aid application to the UK government. "We're keen to get a decision by mid-June," he added.
A decision would coincide with the Paris Air Show - the industry's largest - where the rivalry between the world's biggest plane makers Airbus and Boeing takes centre stage.