The European Commission said on Monday it had received notice from the United States of an end to subsidies ruled illegal by the World Trade Organization, and was checking compliance.
The office of European Union Trade Commissioner Karel De Gucht "today confirms that it has received the compliance notice from the US in the WTO case DS 353, the so-called 'Boeing case'," said spokesman John Clancy in a statement.
"In March this year, the WTO ruled that billions of dollars of subsidies to Boeing were illegal, and the US were given until today to bring those to an end," he explained.
"We will now immediately review their compliance package to check whether the US have taken the necessary steps to end these subsidies and their adverse effects."
US authorities said on Sunday that they had worked for the past six months with governmental bodies including space agency NASA, the Defense Department, the north-western state of Washington and the city of Wichita, Kansas, to ensure conformity with the WTO ruling.
The EU said that the WTO's Appellate Body had found that US federal and state governments granted $5.0-6.0 billion in WTO-incompatible subsidies to Boeing between 1989 and 2006.