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Why do airlines aggressively enforce weight limits on checked bags, charging massive fees for just a few extra pounds?

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Why do airlines aggressively enforce weight limits on checked bags, charging massive fees for just a few extra pounds?

Why do airlines aggressively enforce weight limits on checked bags, charging massive fees for just a few extra pounds?
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Tony Jannus piloted the world's very first scheduled commercial airline flight in 1914, transporting a single paying passenger across Tampa Bay in a trip that lasted a mere twenty-three minutes.

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