“December 11, 1994”, Bokjinka test bombing of Philippine Airlines Flight 434. The device was a liquid based explosive. The "Mark II" "microbombs" had Casio digital watches as the timers, stabilizers that looked like cotton wool balls, and an undetectable nitroglycerin as the explosive. Other ingredients included glycerin, nitrate, sulfuric acid, and minute concentrations of nitrobenzene, silver azide (silver trinitride), and liquid acetone.

2006 transatlantic aircraft plot, planned for sometime in 2006, was also a liquid explosives plot. The plotters allegedly planned to use peroxide-based liquid explosives.

Richard Colvin Reid, (aka. Abdul Raheem) attempted to detonate his explosive on December 22, 2001. Who is to say that there is not someone else out there planning to use another pair of shoes for this purpose right this minute? You? I?