The problem with flights is the time and trouble spent getting to and getting through airports so the flight time has to be long enough to justify the wasted time.
Hyperloop has same problem as flying with terminals being located away from the city. With Hyperloop, the issue is that would require expensive right-of-way or tunnels to bring it into the center of the city. Which is why the initial proposal had end in San Fernando Valley, an hour from LA.
High speed rail has the big advantage that it can use existing tracks, at slower speed, to reach the center city train stations.
High speed rail has the big advantage that it can use existing tracks, at slower speed, to reach the center city train stations.