What is environmentally friendly jet fuel? Some believe it's essential for a greener airline sector.

To launch and maintain a large aeroplane in the air for an extended period of time uses a lot of carbon.

However, United Airlines has made a commitment to becoming a carbon-neutral company by 2050, as have all other IATA members.

United stands out because it doesn't intend to employ carbon offsets,

"United holds 40% of the announced fuel agreements for SAF internationally as of right now.

"The airline industry is aware of its issue. They do not require persuasion.

"They can produce sustainable fuels, but at the moment they don't meet expectations in terms of carbon intensity, volume, or cost.

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