Numerous violent hijackings occur in the U.S.

The FAA creates the Explosives Detection Canine Team Program.

The FAA in December issues an emergency rule requiring all passengers and carry-on baggage to be either screened by metal detectors or searched by hand and requiring airports to station armed guards at boarding checkpoints.

1973

Five Palestinian terrorists open fire at a Rome airport and hurl fire bombs into a Pan Am jet, killing 30 people. They commandeer a Lufthansa jet and fly to Athens; a hostage is killed.

1974

Two people are killed and dozens injured when a bomb explodes near the Pan Am ticket counter at LAX.

The 1974 Air Transportation Security Act sanctions the FAA's universal screening rule, which spurs U.S. airports to adopt metal-detection screening portals for passengers and X-ray inspection systems for carry-on bags.

1985

Lebanese terrorists divert TWA Flight 847 en route from Athens to Rome; one hostage, a U.S. Navy diver, is killed in the 17-day ordeal.

Federal Air Marshals, successors to the Sky Marshals, become a permanent part of the FAA workforce on international flights.

1988

A bomb concealed in a radio-cassette player destroys Pan Am Flight 103, flying from London to New York, over Lockerbie, Scotland, killing 270 people.

U.S. carriers at European and Mideast airports begin to require X-rays or searches of all checked baggage and to match passengers and their baggage.

1995

A plot by Muslim terrorists to blow up 11 U.S. jumbo jets over the Pacific in a single day is uncovered in the Philippines.

1996

TWA Flight 800 explodes after takeoff from New York and crashes into the Atlantic, killing all 230 people aboard. Initially believed to be terrorist-related, the crash is later blamed on equipment failure.

1997

The FAA is provided $100 million for more security personnel and equipment.