I'll add to the skepticism pile-on...

We already have Urban Air Mobility: they're called helicopters, and they have flight limitations that I do not see these UAMs making great strides over anytime soon. The industry/investor hype is so reminiscent of the driverless car phenom that was seemingly just around the corner a few years ago. That one sure has gone quiet, hasn't it? (I'm pretty sure Elon said my Tesla would be out there by now making money for me all by itself between my drives)

Not saying UAMs won't happen. Like most of these new ideas, technical feasibility and commercial viability are two vastly different hurdles. For now it will plod along, powered by pixie dust, wishful thinking, and lots of your tax dollars.