Authorities in the United Kingdom say they have arrested more than 20 people in a terror plot to plant bombs on airliners headed to the United States. Police say the suspects were planning to carry liquid explosives onto as many as 10 planes, and detonate them in mid-air.
Paul DesJardin, assistant professor, mechanical and aerospace engineering, State University of New York, Buffalo
Michael Barr, director of USC Aviation Safety and Security Programs, University of Southern California
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