Pan Am Flight 103 exploded over Lockerbie, Scotland on Dec. 21, 1988, killing 270 people. Twenty five years later, everything has changed: from laws to airport security to joint investigations to the way the media covers terrorist attacks to the word "terrorism" itself.
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Produced by Mary Ballinger, Tom Charles, Megan French, Maggie Quigley and Erika Scully.
Photos courtesy of Pan Am Flight 103/Lockerbie Air Disaster Archive, Perry Russom and Creative Commons-licensed sources.