David Schaper

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Updated September 17, 2021 at 1:03 PM ET

A debate is heating up over whether President Biden's sweeping vaccine mandate should be extended to cover those who travel domestically by plane and train.

It's hard to fathom now, but we used to be able to arrive at the airport just minutes before a flight. We'd keep our shoes and coats on as we went through a simple metal detector, and virtually anyone could go right to the gate without a boarding pass or even showing an ID.

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