The European Court of Justice dealt a blow yesterday to European Union and U.S. policymakers, with two important judgments on privacy and transatlantic relations. Back in 2004, the European Union and the United States signed an agreement guaranteeing the privacy of European airline passenger data when that data was transferred to the U.S. government. In European Parliament v. Council of the European Union and European Parliament v. Commission of the European Communities, the Court of Justice found that the Europeans did not have the power, under their constitutional rules, to enter into the agreement. Luckily for the airlines and the governments, the Court delayed the effect of its decision until September 30, 2006. Until then, European airlines will keep on being able to transfer their passenger data—and keep on being able to fly into American airports–without having to worry about breaking European privacy law. Afterwards, it could get complicated.