The only reason point-to-point is successful is because regional airports are cheaper than larger airports. By economy of scale, larger airports should be chea

The only reason point-to-point is successful is because regional airports are cheaper than larger airports. By economy of scale, larger airports should be cheaper. The reason they're not is that regional airports are heavily subsidized. If air travel subsidies would spontaneously end tomorrow, we'd see a return to the hub- and spoke model, more A380 flights, less 737-MAX8/A320neo demand, lower air travel emissions, and better competitiveness for trains.