Airplanes may be a marvel of modern engineering, but unless you're flying first-class it isn't what most people would call glamorous. For many, the biggest problem is how crowded airliners can get. But believe it or not, there was a time when flights rarely left more than half full. How was this possible? It might be hard to believe in a world where you must book your flight months in advance, but there was a time when you could simply drive to the airport on a whim and go almost anywhere you wanted. If you were lucky, you might even get the whole row to yourself! 

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