"The new Transportation Security Administration system seeks to probe deeper into each passenger's identity than is currently possible, comparing personal information against criminal records and intelligence information. Passengers will be assigned a color code -- green, yellow or red -- based in part on their city of departure, destination, traveling companions and date of ticket purchase.
Most people will be coded green and sail through. But up to 8 percent of passengers who board the nation's 26,000 daily flights will be coded "yellow" and will undergo additional screening at the checkpoint, according to people familiar with the program. An estimated 1 to 2 percent will be labeled "red" and will be prohibited from boarding. These passengers also will face police questioning and may be arrested."