United Airlines launched a first-of-its-kind investment vehicle supporting start-ups focused on decarbonizing aviation and, specifically, scaling sustainable aviation fuel. The Fund launched with over $100 million in funding dedicated to SAF from both UAV and its inaugural corporate anchor partners. Five months after its initial launch, the Fund increased its investment power to nearly $200 million and added eight new corporate partners. Some investments the Fund has made include contributions to a bioengineering company focusing on algae oil as a feedstock for SAF, a carbon capture technology company, and a start-up focused on creating SAF from carbon dioxide captured from industry or power plants and hydrogen from renewable sources.

United's Flight for the Planet program made aviation history by flying the most eco-friendly commercial flight of its kind. The flight included the utilization of sustainable aviation biofuel, zero cabin waste, carbon-offsetting and increased operational efficiencies. 30% of the fuel burned on the eco-friendly flight from Chicago to Los Angeles was aviation biofuel.

https://hub.united.com/united-most-eco-friendly--flight-2638700079.html​​

As the first airline to partner with Clean the World, United Airlines donates all their unused amenity kits to be redesigned as hygiene kits. The project aims to reduce landfill waste and, as of 2018, diverted over 80,000 pounds of potential waste through product upcycling.

https://www.united.com/ual/en/us/fly/company/global-citizenship/ecoSkies/​

With the single largest investment by a U.S. airline in alternative fuels, United Airlines entered an agreement with Fulcrum BioEnergy Inc. to purchase at least 90 million gallons of sustainable aviation fuel (SAF) for a minimum of 10 years. United aims to set itself apart from the aviation industry in advancing SAF use and reducing carbon emission.

https://hub.united.com/united-launch-flights-sustainable-biofuel-2567373100.html​​

Southwest's commitments to sustainability covers a broad range of programs aimed at minimizing environmental impacts all while maintaining focus on the triple bottom line. Programs include Southwest's LUV Seat: Repurpose with Purpose project, which upcycles airline seat fabric; and the Heart of the Community program to build public spaces in communities nationwide.

http://investors.southwest.com/~/media/Files/S/Southwest-IR/2015_SouthwestAirlinesOneReport.pdf​​

In recognition of your outstanding leadership in pursuit of sustainability within the aviation industry. FedEx has integrated responsible environmental practices into their daily operations and continuously set goals in the areas of conservation, alternative energy, industry leadership, and environmental policy. Through a progressive fuel sense program, FedEx has reduced the in-gate aircraft APU usage by 1.5 hours of engine use per flight throughout the fleet, saving one million gallons of jet fuel per month. At just under 175,000 square feet, the FedEx Express cargo facility at O'Hare is home to the largest green roof at any U.S. airport.

https://sustainability.fedex.com/​