William Moore
19 August 2024

Carbon analysis: Efficiency of the US “second four” improves annually

British Airways Boeing 737-9

Photo credit: Alaska Airlines

This week’s Carbon Analysis looks again at the US “Second Four”, this time with annual figures. The airlines in question are Alaska Airlines, Frontier Airlines, JetBlue Airways and Spirit Airlines. Emissions are given in kgCO2/available seat kilometer (ASK) for 2019, 2021 and 2023. The results…

William Moore

William is a UK-based aerospace sustainable technology analyst specialising in aviation electrification and the emerging Advanced Air Mobility (AAM) industry.

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