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46 C h a p t e r 6 As alternative jet fuel commercialization advances and becomes part of the fuel mix, airports should be aware that they may need to support the associated changes in the jet fuel supply system to accommodate the needs of their customers for using these new fuels. As noted in this guide- book, airlines and other aircraft owners have committed to purchasing alternative jet fuels for a variety of reasons, including diversification of their supply chains and reduction of their GHG emissions. Alternative jet fuels may have to be tracked separately from conventional jet fuels to ensure that the fuel purchasers receive full credit for their use. With respect to choosing an appropriate tracking mechanism, airport managers and other interested stakeholders should keep in mind that: â¢ The needs for tracking will ultimately be decided by regulations and policies still under development; â¢ Several different fuel tracking mechanisms are available to meet the different needs of fuel purchasers, regulators, and other stakeholders; â¢ The costs of implementing different fuel tracking mechanisms vary depending on the mechanism and existing fuel handling infrastructure; â¢ Any or all of these fuel tracking mechanisms may be used to meet the needs of different stake- holders; and â¢ The selection of appropriate tracking mechanism(s) should be done in consultation with the fuel purchaser(s). As part of this guidebook, a toolkit consisting of a spreadsheet for tracking and accounting for alternative fuel use as well as a spreadsheet for computing GHG emissions from the use of the fuel has been provided. These spreadsheets are meant to demonstrate the type of information and computations that may be required to track alternative jet fuels and some of their potential benefits. Conclusion