The 9/11 terror attacks changed air travel for travelers, airports and airlines, some frequent fliers say. Travelers say the Transportation Security Administration's security measures are overly aggressive and intrude upon privacy rights. Separately, some experts say the airlines remain vulnerable to security risks, while others say the measures are key to keeping commercial aviation safe. "There is no doubt in my mind that it's safer to fly today than it's ever been," said aviation security consultant Doug Laird.
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