The Threat: How the FBI Protects America in the Age of Terror and Trump by Andrew G. McCabe:
In the summer of 2006 I moved out of organized crime and into counterterrorism. My first case was the London airliner plot. A bunch of young terrorists had learned how to make bombs out of easily available household products. The airliner plot is the reason why, today, when you get on an airplane, all your liquids, aerosols, gels, creams, and pastes have to fit inside a quart-sized plastic bag. The key word for understanding this case—its plain facts and its larger significance—is “components.”
The terrorists had devised a way to break down the components of explosive devices so that they could elude detection at airports by airport security and then reassemble the devices once an airliner was aloft. My unit and I gathered intelligence from the British investigation and tried to determine if any Americans were involved. Coordinating the various services—the FBI and CIA; British intelligence and others—required learning how to share information seamlessly. This case also brought me face-to-face for the first time with the man who succeeded Louis Freeh as FBI director, Robert Mueller.