The U.S. backs a proposal by the International Civil Aviation Organization to lower global aviation emissions that would take effect in 2020, but it does not support exemptions for other countries for interim measures. "If such a large set of countries can get a blanket exception on market-based measures, we are concerned that this could be a slippery slope to requests for exemption on other taxes and charges, and even safety and/or security measures," said Nancy Young, vice president for environmental affairs for Airlines for America.

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