Pretty sure I've seen them in Salt Lake & Heathrow | Hacker News

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		robertfw on June 11, 2015 \| parent \| context \| favorite \| on: Reassessing Airport Security Pretty sure I've seen them in Salt Lake & Heathrow

bradleyland on June 11, 2015 [–]

...and Portland, OR and Orlando, FL.

They're growing in popularity.

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