21.   Screeners at airport security checkpoints miss weapons that undercover testers hide under their clothes, or they notice them but do nothing.

22.   Southwest spokeswoman Melanie Jones said the increased scrutiny will mean that it will take customers longer to clear airport security checkpoints.

23.   The chief said an average of two stops for weapons are made a week at airport security checkpoints at the sprawling airport.

24.   The ease with which the terrorists slipped through airport checkpoints, however, has authorities scrambling to study new surveillance methods.

25.   The president stopped short of answering the call on Capitol Hill for a complete federalization of airport checkpoints, including the creation of a federal force of passenger screeners.

26.   The technology can be used, for example, to scan faces at an airport checkpoint and match them against a database of suspected terrorists.

27.   The terrorists had cleared airport security checkpoints in Boston, Newark, N.J., and Dulles, Va. that were staffed by private security guards.

28.   Women Complain About Searches At airport security checkpoints, women travelers are routinely frisked by male guards, which can make many of the fliers uncomfortable.

29.   A civil rights organization is demanding that Northwest Airlines apologize for allegedly forcing a Muslim high school student to remove her head scarf at an airport security checkpoint.

30.   Armed agents from the U.S. Marshals Service, U.S. Border Patrol and U.S. Customs were deployed at airport security checkpoints across the country.