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Large cities worldwide suffer from traffic congestion, leading to huge economic, social, and environmental costs. 1 Various measures have been taken, spanning congestion pricing, public transportation promotion, high-occupancy driving lanes, and road space rationing to recent on-demand ride-sharing models, etc. 2–4 However, none of them can solve this inherent problem due to the asymmetry between transport infrastructure and dynamic travel demand. Opportunities to expand road capacity are rare, but an emerging on-demand transportation mode, urban aerial mobility (UAM), is unlocking tremendous traffic capacity in the urban low-altitude space, leading to a perfect solution to traffic congestion. 5 The rise of UAM is thanks to the recent developments of electric vertical-takeoff-and-landing (eVTOL) vehicles. These vehicles leverage the infrastructure of vertiports for takeoff and landing and are coupled with …