"Just wondering what kind of liquid explosives are capable of blowing up a jet?"
In mid-air you only need a very minor charge to do heavy structural damage to plane. You have to remember that a passenger aircraft is basically a pressurized tube, so if you blow out a single window that's like drillig a hole into an eggshell: It looses all its stability.
TWA flt 800 was propably a test bed for this