For years, electric flying taxi startups have sold their aircraft as quiet, safe and sort of cuddly vehicles that in the future will carry passengers at low cost to the airport and elsewhere, soaring enviably over cars stuck in traffic.

For years, electric flying taxi startups have sold their aircraft as quiet, safe and sort of cuddly vehicles that in the future will carry passengers at low cost to the airport…

If electric flying taxis crowd the low-altitude skies in the coming years, as startups predict, how will they manage not to crash into one another?