^ This. Think about the capacity constraints during your typical commute. All those times you have ever been held up in traffic could be massively diminished thanks to increase short-hop flight commutes.
You want to end traffic with modern accessible tech?
Build ten layer freeways.
Today only the Uber-rich can afford short haul flying. With a airtaxi/flying car scenario, just about anyone could fly across their metro area for some special occasion.