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Prime Minister David Cameron's cat, Larry, sits on the steps of No. 10 Downing St. in London on June 24, the day Brexit voting results were announced. If the Cameron family wants to take Larry along on holiday to France, a Brexit could complicate plans. It's possible that traveling to and from the EU with pets will grow more cumbersome.
Passengers walk through a TSA checkpoint area at Los Angeles International Airport. Security experts say making airports safer is a huge challenge because public areas are designed for commerce.
Patrick T. Fallon/Bloomberg via Getty Images