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24 Guidelines for Integrating Alternative Jet Fuel into the Airport Setting 2.6.4 EPA Renewable Fuel Standards The EPA adopted a renewable fuel standard (RFS) called RFS-2 in February 2010 (EPA 2010c). While aviation does not have a required biofuels contribution under RFS-2, producers of alterna- tive fuel for aviation may generate benefits in the form of tradable credits for fuels merited by their ability to provide benefits as quantified by the Renewable Index Number (RIN) of those fuels. 2.6.5 Federal Rules for Purchase of Alternative Fuels Section 526 of the 2007 Department of Energy (DOE) Authorization mandates that U.S. gov- ernment buyers can only purchase alternative fuels if their life-cycle GHG footprint is less than that of petroleum-based fuels (Sissine 2007). In the case of alternative jet fuels, this can be of relevance to airports that have or want to attract government customers such as the air national guard. Furthermore, the U.S. Air Force and DOE have published peer-reviewed procedures to help alternative jet fuel companies verify that their products meet the requirements of Section 526 (NETL 2008; Allen et al. 2009). These documents can also be of value to airports interested in a better understanding of the process to determine the life-cycle GHG footprint of alternative jet fuels and overall compliance with Section 526.