The U.S. Department of Homeland Security and the U.S. Department of State has decided to suspend the TWOV and ITI programs as of Aug 2, 2003.

Therefore, airlines are no longer allowed to use the TWOV and ITI programs.  This new policy will be reassessed in the next 60 days.

United released a Hotboard Announcement about this, and it appears below:

Until further notice, the U.S. Department of Homeland Security and the U.S. Department of State suspended two programs that allow certain international air passengers to travel through the United States for transit purposes without first obtaining a visa. The programs, known as the Transit Without Visa program (TWOV) and the International-to-International transit program (ITI), have been suspended as of 11:00 a.m. (EDT) on Saturday, August 2, 2003.

This action does not affect U.S. citizens or citizens from visa waiver countries. International gateway cities (LAX, MIA, JFK, DFW, HOU) will be most impacted, however, as a result of media coverage, customers may ask for information at other airport locations as well.

Homeland Security issued instructions to all airlines to no longer allow passengers to utilize these transit programs. Homeland Security agencies are also taking additional steps to increase security at airports and on airplanes that normally transport and process passengers under these programs.

Travelers who purchased tickets on or before July 24, scheduled to depart before 0001 Tuesday, August 5 need not obtain a visa. If a customer has already traveled on TWOV or ITI on the first leg of their trip and used the return before 1100, August 9, they are permitted to make a stop in the U.S. without a visa.

More information is available in the Apollo profile: S*UAL/INTL-TWOV. This document will be updated regularly, so please do not print it as the information you print may become obsolete. You may also visit www.dhs.gov and www.travel.state.gov for additional information.

Homeland Security and the Department of State will review public comment and the suspension will be reassessed over the next 60 days.

Not going to miss those TWOV procedures too much...  I always got stressed thinking that I'd lose that blue envelope somewhere in the galley or behind 1L!