A coalition of American airlines and aviation industry organizations sent a letter July 30 to the departments of State and Treasury asking them to take action to reverse the European Union’s decision to include aviation greenhouse gas emissions in its Emissions Trading System. The group asked the United States to file a challenge under the Convention on International Civil Aviation, or the Chicago Convention, as under the convention, any government party to the treaty can bring a disagreement to the International Civil Aviation Organization. The two agencies hosted 16 countries that oppose including airlines in the EU ETS at a meeting July 31-August 1 on the trading system.