UPDATED MAY 15, 2009: New Secure Flight Program.
The TSA now requires additional information of each passenger for security purposes. Not all of the following information will be printable on paper airline tickets, boarding passes or reservation itineraries.
For more information visit the TSA website using the following hyperlink:
http://www.tsa.gov/what_we_do/layers/secureflight/faqs.shtm#traveler_faqs