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In page Phase-out of fossil fuel vehicles:

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Besides the need to rapidly scale up currently minuscule production capacity, the main obstacles to wider deployment of sustainable aviation fuels and e-Fuels are their much higher cost in the absence of meaningful carbon pricing in aviation.[12] Furthermore, with current CORSIA regulations for sustainable aviation fuels allowing up to 90% of emissions compared to conventional fuels, even those options are currently far from carbon neutral.[13] However, short haul, low demand routes can be easily flown using electric aircraft, and manufacturers such as Heart Aerospace are planning to introduce them with United Airlines in 2026.[citation needed]