It is indeed specific, but I think that you're underselling it slightly. Airstrips are low-throughput, you could imagine that VTOL air taxis could offer a lot

It is indeed specific, but I think that you're underselling it slightly. Airstrips are low-throughput, you could imagine that VTOL air taxis could offer a lot more individual vehicles in the same geographic footprint. And they're much faster than ferries. They could potentially fly over shipping lanes that make bridges difficult due to height restrictions, and underwater tunnels are expensive. If going over a natural area, people might have fewer environmental concerns about flying air taxis over it than building a rail or road line through it. Some areas I could see it being vaguely plausible are: Kitsap Penninsula or Vashon Island to Seattle. The various islands of NYC. The various islands of Hong Kong. Between Copenhagen and Malmo. I'm sure there are more. I don't think this would add up to a $20B business or anything, but it's unclear to me that Page cares about that.