Airports and airlines have taken elaborate steps to prepare for the busy Thanksgiving travel season, but the Transportation Security Administration's new pat-down procedure could slow down security lines, writes Scott McCartney in The Wall Street Journal. Under current rules, travelers who refuse to pass through a scanner or who set off a scanner must submit to the new pat-down procedure. Some travelers have said the pat-downs raise privacy concerns, but the TSA says they are necessary to prevent terrorism.

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