The electronic boarding pass pilot enables passengers to download their boarding pass on their cell phones or personal digital assistants (PDAs). This innovative approach streamlines the customer experience while heightening the ability to detect fraudulent boarding passes. Each paperless boarding pass is displayed as an encrypted two-dimensional bar code along with passenger and flight information. TSA security officers use hand-held scanners to validate the authenticity of the boarding pass at the checkpoint.
http://www.tsa.gov/approach/tech/pap...expansion.shtm
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