21.   A member of the National Guard at Churchill Downs for the Kentucky Oaks checks Jean Haynes at a security checkpoint, Friday.

22.   A headline news service for pagers was reporting a man had run through a security checkpoint with a gun.

23.   A Northwest Airlines pilot walked past a security checkpoint without identification and a ground service worker walked through the checkpoint with a pocket knife.

24.   A passenger with an electronic ticket, for example, cannot get through an airport security checkpoint without paper work listing the ticket number.

25.   A stainless steel lattice was erected to prevent jumpers and security checkpoints were built as safeguards against weapons.

26.   According to people who were at the airport when the incident began, lines at the security checkpoint began backing up shortly before noon.

27.   After all, the airlines, which are primarily responsible for the security checkpoints, have fought efforts to professionalize the work force.

28.   Airlines, which pay the people who actually run the security checkpoints and inspect carry-on luggage, can be more restrictive.

29.   Agents from the US Marshals Service, US Border Patrol, and US Customs were posted at airport security checkpoints nationwide.

30.   All have passes allowing them through the security checkpoints, and none have been checked for a criminal past.