"They're more restricted when you get into adverse weather, " says David Castelveter, a spokesman for the Air Transport Association, the industry group for major carriers.

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The policy change was based on a recommendation from an internal TSA working group, which decided the items represented no real danger, said David Castelveter, a spokesman for the agency.

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"TSA continues to closely monitor the review of the incidents as well as the security protocols being conducted by the air carrier and the airport authority, " spokesman David Castelveter said.

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