A growing number of airline passengers, and even flight crews, have complained about the latest security measures at America's airports -- including new body scanners and the required pat downs.

Full body scanners are currently being used at 60 U.S. airports. They allow screeners to detect anything hidden on a person's body. However, some fear the machine's radiation could be a health risk to passengers.

"The risks are very small, but multiply by 300 times for a pilot each year, and you are starting to get some concerns even on an individual basis," said Dr. David Brenner, the head of Columbia University's center for Radiological Research.

Union leaders have urged flight crews to seek checkpoints that don't require the scanners.

Flight crews and passengers can avoid the scanners, but they must submit to a full-body pat down by Transportation Security Administration agents that some say is invasive.

"We don't want them in uniform going through this enhanced screening where their private areas are being touched in public," said Deborah Volpe, vice president of the Association of Flight Attendants.

Still, some pilots unions have encouraged members to go ahead with the pat down and then assess whether they're emotionally fit to fly after their encounter with the TSA agents.

Yet, some flyers said they're okay with a little radiation and occasional pat down in the name of safety.

One flyer who's fed up with the body scans has encouraged passengers to opt out of standing in the scanner and instead, request a pat down on one of the busiest travel days of of the year -- the day before Thanksgiving.

Since pat downs take a longer amount of time, the idea is to cause delays -- and send the federal government a message.