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"We need to alleviate air traffic congestion by eliminating inefficient short-hop flights with ground-based high-speed rail and Maglev. "

I wonder what the cost difference would be to create smaller, regional airports, to handle short-hop flights and alleviate congestion in the large "hubs," versus creating a large network of high-speed rail lines.

[Willie Green]

create smaller, regional airports, to handle short-hop flights and alleviate congestion in the large "hubs,"

It wouldn't work.
It's the air corridors that are congested, not just the "hubs".
We have to make more room in the sky by traveling on the ground.

Just last week, a United Airlines flight waiting to land at Reagan National Airport near Washington came within less than a mile of a Gulfstream business jet that was climbing after taking off from another nearby airport.