With Las Vegas and Orlando, Fla., leading a list of Americans' most popular travel destinations and the summer season upon us, travelers can expect to pack flip-flops, a beach towel and lots of patience. Airports have stepped up security measures over the past few years, making hassles an expected part of the trip. "It's a challenge for passengers to understand the why behind some of our procedures," acknowledged Lauren Gaches, a spokeswoman for the Transportation Security Administration.

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