The Air Transport Association fired off a letter to Todd Stern, the U.S. Climate modify Envoy, requesting that the U.S. stand against a proposed international tax on aviation emissions. In the letter, the ATA states that the worldwide Air Passenger Adaptation Levy (PDF), proposed by a set of countries led by The Maldives, would lead to undue price hikes in air tickets. The levy would support climate change improvement efforts in the developing world. The ATA estimates that the levy could add anywhere from $6-62 extra in fees per global flight sold. The ATA says it wants the Obama management to support the International Civil Aviation Organization in taking the lead role in developing and implementing a universal sectoral framework for aviation and climate change.