Khalid Sheikh Mohammed (sometimes also spelled Khalid Shaikh Mohammed; among at least fifty pseudonyms; born March 1, 1964) is an Islamist militant held by the United States at the Guantanamo Bay detention camp under terrorism-related charges. He was named as "the principal architect of the 9/11 attacks" in the 9/11 Commission Report. Sheikh Mohammed was a member of Osama bin Laden's al-Qaeda organization, leading al-Qaeda's propaganda operations from around 1999 until late 2001. He confessed to FBI and CIA agents to a role in many of the most significant terrorist plots over the last twenty years, but his interrogators' use of enhanced interrogation techniques has caused some to question certain aspects of his confessions.

Mohammed traveled to the Philippines in 1994 to work with his nephew Ramzi Yousef on the Bojinka plot, a Manila-based plot to destroy twelve commercial airliners flying routes between the United States, East Asia, and Southeast Asia. The 9/11 Commission Report says that "this marked the first time KSM took part in the actual planning of a terrorist operation."  "Using airline timetables, Khalid Sheikh Mohammed and Ramzi Yousef devised a scheme whereby five men could, in a single day, board 12 flights--two each for three of the men, three each for the other two--assemble and deposit their bombs and exit the planes, leaving timers to ignite the bombs up to several days afterward. By the time the bombs exploded, the men would be far away and far from reasonable suspicion. The math was simple: 12 flights with at least 400 people per flight. Somewhere in the neighborhood of 5,000 deaths. It would be a day of glory for them, calamity for the Americans they supposed would fill the aircraft."  Bojinka plans included renting or buying a Cessna, packing it with explosives and crash landing it into CIA headquarters, with a backup plan to hijack the twelfth airliner in the air and use that instead. This information was reported in detail to the U.S. at the time.  In December 1994, Yousef had engaged in a test of a bomb on Philippine Airlines Flight 434 using only about ten percent of the explosives that were to be used in each of the bombs to be planted on US airliners. The test resulted in the death of a Japanese national on board a flight from the Philippines to Japan. Mohammed conspired with Yousef in the plot until it was uncovered on January 6, 1995. Yousef was captured February 7 of that same year.  Khalid Sheikh Mohammed was indicted on terrorism charges in the United States District Court for the Southern District of New York in January 1996 for his alleged involvement in Operation Bojinka, and was subsequently placed on the October 10, 2001, initial list of the FBI's twenty-two Most Wanted Terrorists.Answer this question using a quote from the following article:

Did operation Bojinka happened ?
In December 1994, Yousef had engaged in a test of a bomb on Philippine Airlines Flight 434