Pretty darn interesting! I would imagine that available space and cost would be show-stoppers for any existing airport to re-work both the terminals and the runways, but maybe new ones...
Also imagine the local uproar if residential areas previously unaffected by air traffic noise now have to deal with airplanes coming in from different (all) directions and flying over their neighborhoods. I would not be happy. I live a 10 minute drive from SFO and never hear a peep. I paid for that privilege and would not take kindly to such an effect on my real estate value.
Hard to imagine the cost/benefit is worth it. Kudos for the thinking though, maybe I'm just a naysayer.
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