Airline seats should be mounted on rails, so the rows of seats could be moved up and down the aisle and locked into place. When the plane is less than full, the crew could move the seats (manually or automatically), so that passenger leg room is maximized.

Some airlines (like United) charge a premium for a mere 5 additional inches of legroom. When the plane is less than full, the airline should make that spare leg room available to the passengers for free.

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