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You say that, but flying economy was much better back then. Less fights, more legroom. You've got to fly business today to get close.
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And most families only had a single car prior to 1980.

What's your point?

Did airlines get cheaper due to deregulation or because technology and engineering made operating them cheaper?

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Or as simple as incomes crept up and airlines reduced some amenities - both allowing for increased ridership which helped to reduce per head costs.
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