I have always argued that Xanax (a widely prescribed tranquilizer) needs to be added to the water supply in addition to a copious amount of Prozac (a widely prescribed antidepressant). In one day how there could be so many airplane passenger incidents in this terrible new world is beyond me (from the Associated Press):

_A college student's checked luggage on a Continental Airlines flight from Argentina contained dynamite, authorities said, in one of six security incidents Friday that caused U.S. flights to be diverted, evacuated or searched. Federal authorities were investigating why the student, who got off the Continental plane in Houston before it continued to Newark, N.J., had the explosive residue, FBI spokeswoman Shauna Dunlap said. She said the student did not appear to be connected to terrorism. Houston Fire Department Assistant Chief Omero Longoria said the man told authorities he works in mining and often handles explosives. Longoria said federal officials were investigating whether the explanation was true. In Houston, the dynamite was found during a luggage search in a federal inspection station at Bush Intercontinental Airport shortly after Flight 52 landed at about 6 a.m. Marlene McClinton, spokeswoman for the Houston Airport System, said a bomb-sniffing dog "had a hit" on explosive residue during a further search.

In other incidents:

_An American Airlines flight from England to Chicago was forced to land in Bangor, Maine, in response to an unspecified threat, authorities said. Passengers deplaned and were led to a holding area, said airport manager Rebecca Hupp. The jetliner was on the tarmac with its engines shut off.

_A US Airways jet was diverted to Oklahoma City after a federal air marshal subdued a disruptive passenger who had pushed a flight attendant, the FBI said.

_A Continental Airlines flight from Corpus Christi, Texas, to Bakersfield, Calif., was held in El Paso, one of its scheduled stops, after the crew discovered a missing panel in the lavatory, authorities said.

_A utility knife was found on a vacant passenger seat of a US Airways flight traveling from Philadelphia to Bradley International Airport in Connecticut, state police said.

_An Aer Lingus flight from New York to Dublin was evacuated Friday morning during a scheduled stopover in western Ireland following a bomb threat that turned out to be unfounded, officials said.

Pilots and flight attendants are now trained to view passengers who appear to be crazy as potential terrorists, Breslin said. But even if a disruptive passenger isn't a terrorist, "who knows what kind of havoc he could wreak on a closed pressurized tube at 39,000 feet?" he said.

In Oklahoma City, the passenger who pushed the flight attendant on the US Airways flight was taken into custody after the plane landed at Will Rogers World Airport, FBI spokesman Gary Johnson said. He was undergoing a mental evaluation, and authorities had yet to determine what criminal charges he might face. The twin-engine jet returned to flight three hours later on its trip from Phoenix to Charlotte, N.C.

Back in Texas, the crew of Continental Airlines Flight 2258 discovered a missing panel in the lavatory, and passengers were being screened and interviewed upon landing in El Paso, the TSA's Amy von Walter said.