from the International Council on Clean Transportation (ICCT) found that even today, around 26% of US flights could be replaced by car, bus or high-speed rail. Another 28% of flights could in theory be replaced by high-speed rail, but are between less populated urban centres, meaning not enough people would travel on them make the investment in high-speed rail infrastructure worth it, says Sola Zheng, a researcher at ICCT who did the analysis. In a world of no flying, however, there would likely be more political and taxpayer willingness to build high-speed rail, as well as a higher tolerance for travel time, says Zheng.

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