The document summarizes a workshop on greening airport fleets through the use of alternative fuels. It discusses how some airports like Southwest and United have transitioned significant portions of their ground support equipment to run on alternative fuels like electricity. However, it also notes challenges in acquiring and maintaining alternative fuel vehicles, a lack of confidence in using them, and making contractual requirements for taxis and shuttles to use alternative fuels. The document concludes by discussing electric vehicle charging stations and a vision for the future of alternative fuels at airports.