A traveler undergoes a full body scan performed by Transportation Security Administration agents as she and others pass through the security checkpoint at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic the day before Thanksgiving, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to 'opt out' of the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

Travelers undergo pat downs by a Transportation Security Administration agent at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A Transportation Security Administration agent performs an enhanced pat down on an elderly traveler at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic the day before Thanksgiving, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes a full body scan performed by Transportation Security Administration agents at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic the day before Thanksgiving, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to 'opt out' of the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

Air travelers move through a main security checkpoint at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic the day before Thanksgiving, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to 'opt out' of the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes a full body scan performed by Transportation Security Administration agents at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A Transportation Security Administration agent pushes items through an x-ray machine at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic the day before Thanksgiving, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to 'opt out' of the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes an enhanced pat down by a Transportation Security Administration agent at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes a full body scan performed by Transportation Security Administration agents at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes an enhanced pat down by a Transportation Security Administration agent at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes an enhanced pat down by a Transportation Security Administration agent at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes a full body scan performed by Transportation Security Administration agents at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

An air crew member undergoes a pat down by a Transportation Security Administration agent at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic before the Thanksgiving holiday, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more

A traveler undergoes a full body scan performed by Transportation Security Administration agents at the Denver International Airport on November 22, 2010 in Denver, Colorado. The TSA is bracing for heavy traffic the day before Thanksgiving, as two separate internet campaigns are promoting a 'National Opt-Out Day' protest during which travelers are urged to refuse the new body scanners because of concerns over privacy and possible exposure to radiation. Those passengers who refuse the scans must instead undergo an enhanced pat down by TSA agents, which could further slow down security lines on the busiest air travel day of the year. Show more