The two had already converted fourteen bottles of contact lens solution into bottles containing nitroglycerin, which was readily available in the Philippines. Yousef taped a metal rod to the arch of his of foot in place of the detonators. Yousef and Mohammed wore jewelry and clothing with metal to confuse airport security. They packed condoms in their bags to support their story that they were meeting women. <7>
<snip>
On December 11, 1994, Yousef built another bomb, which had one tenth of the power that his final bombs were planned to have, in the lavatory of an aircraft. He left it inside the life jacket under his seat, 26K, and got off the plane when it arrived in Cebu. Yousef had boarded the flight under the assumed name of Armaldo Forlani, using a false Italian passport. The aircraft was Philippine Airlines Flight 434 on a Manila to Narita route, stopping partway at Cebu. Yousef had set the timer for four hours after he got off the aircraft. The bomb exploded while the aircraft was over Minami Daito Island, near Okinawa, Japan. A Japanese businessman named Haruki Ikegami was killed after the bomb detonated. The Boeing 747-200 safely made an emergency landing in Naha, Okinawa. None of the aircraft's other 272 passengers or any members of the crew were killed, although 10 passengers in front of Ikegami were injured. Yousef then planned which flights to attack for Phase I.
http://en.wikipedia.org/wiki/Operation_Bojinka===========================
Why start banning liquids NOW in carry-on, 13 years later?