American Airlines Flight 444

American Airlines Flight 444 was a scheduled American Airlines flight from Chicago to Washington, D.C.'s National Airport. On November 15, 1979, the Boeing 727 serving the flight was attacked by Ted Kaczynski (also known as the Unabomber), who sent a pipe bomb in the mail and set it to detonate at a certain altitude. The bomb partially detonated in the cargo hold and caused "a sucking explosion and a loss of pressure," which was then followed by large quantities of smoke filling the passenger cabin, forcing the pilots to make an emergency landing at Dulles International Airport. Twelve passengers had to be treated afterward for smoke inhalation.

American Airlines Flight 444

N876AA, the aircraft involved in the accident, photographed in January 24, 1998.
Occurrence
Date	November 15, 1979
Summary	Bombing
Site	near Washington Dulles International Airport 38.953°N 77.450°W / 38.953; -77.450
Aircraft
Aircraft type	Boeing 727-223
Operator	American Airlines
Registration	N876AA
Flight origin	Chicago O'Hare International Airport
Destination	Washington National Airport
Occupants	78
Passengers	72
Crew	6
Fatalities	0
Injuries	12
Survivors	78 (all)

Bombing a commercial airliner, especially one flying through an interstate route as Flight 444 was at the time, and still is, a federal criminal offense. After the incident, the FBI was quickly called in to investigate. The FBI investigators assigned to the case found similarities between the still relatively intact pipe bomb and two bombs that had previously detonated at Northwestern University. This prompted federal authorities to assign the name "Unabomber" (for University and Airline Bomber) to the then-unknown suspect, and sparked one of the longest and most expensive manhunts in FBI history, which finally ended 17 years later with Ted Kaczynski being arrested and charged in 1996.