ATLANTA  Americans celebrated National Opt-Out Day in relative quiet on Wednesday, partaking peacefully in the traditional running of the airport security line, even when that tradition included full-body scans and pat-downs.

The Web-driven protest campaign encouraging holiday fliers to opt out of the body scanners and choose the more time-consuming and physical pat-downs passed largely unobserved in key airports around the country.

Lines moved fairly quickly at security checkpoints, passengers generally refrained from complaint, and the chaos and congestion anticipated by many in the news media and feared by many travelers did not materialize. As for the new security measures, travelers for the most part accepted them with resignation or indifference.

“We’ve had 10 years to be desensitized; I’m not sure why people are freaking out now,” said Dr. Janice Manjuck, 50, a physician from San Francisco who was traveling with her husband and 11-year-old son to Norfolk, Va. Dr. Manjuck said she doubted the efficacy of the pat-downs and body scanners, but did not particularly object to them.