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This rulemaking responds to a petition EPA received in Dec 2007 which requested that EPA make an endangerment finding for aircraft GHGs and regulate these emissions under section 231 of the Clean Air Act (CAA). Petitioner filed a lawsuit in 2010 on this matter, and the D.C. District Court in 2012 ruled that the CAA required EPA to make a final determination on whether aircraft GHG emissions cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare. EPA is now moving forward to propose findings regarding aircraft GHG emissions. In this action, EPA will determine whether greenhouse gas emissions from aircraft cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare. The aircraft GHG endangerment finding proposal will rely on previous peer-reviewed science from the major climate change science assessments of the U.S. Global Change Research Program (USGCRP), National Research Council (NRC), and the Intergovernmental Panel on Climate Change (IPCC) underlying the 2009 section 202 CAA endangerment and cause or contribute finding, along with updated reports from the same major climate change assessments. Concurrent with these proposed findings, EPA will release an Advanced Notice of Proposed Rulemaking (ANPRM) to provide an overview of the International Civil Aviation Organization's (ICAO) efforts to reduce greenhouse gas emissions. The ANPRM will include a discussion of ICAO's progress in establishing global aircraft standards that achieve meaningful CO2 reductions and, if EPA finds that aircraft GHG emissions do cause or contribute to endangering air pollution, the potential use of section 231 to implement these standards domestically insuring transparency and the opportunity for public comment.