That is simply factually incorrect. It was known that Al-Qaeda had attempted similar attacks years before 9/11. You can try and spin it however much you want to but it doesn't alter the facts:
Attacks Using Planes as Weapons
Careful examination of the published record clearly shows these claims there were no warnings are simply not true. Historically there have been many attacks using planes as weapons, an obvious example being the kamikaze strikes by Japanese pilots on Allied ships in World War II. More recently, in 1994, there were three separate attempts to hijack airplanes and fly them into buildings. A disgruntled Federal Express worker tried to crash a DC-10 into a company building in Memphis but was overpowered by the crew.A lone pilot crashed a small plane onto the White House grounds, just missing the presidents bedroom.
An Air France flight was hijacked by a terrorist group linked to al-Qaeda, with the aim of flying it into the Eiffel Tower; however, French Special Forces stormed the plane while it was refueling.[New York Times, 10/3/01]
In January 1995, acclaimed 9/11 mastermind Khalid Shaikh Mohammed and others were within weeks of implementing a massive plot named Operation Bojinka when they were foiled by authorities in the Philippines. This plot involved the simultaneous bombing of up to a dozen passenger airliners flying over the Pacific Ocean.
But in some variations of this plan, planes were to be hijacked and flown into key structures in the United States. According to a US intelligence analysis shortly after the plot was uncovered, The World Trade Center, the White House, the Pentagon, the Transamerican Tower, and the Sears Tower were among the prominent structures that had been identified in the plans that we had decoded. [Village Voice, 9/26/01] One pilot, Abdul Hakim Murad (who incidentally learned to fly in US flight schools), confessed that his role was to crash a plane into CIA headquarters. [Washington Post, 9/23/01]
Details of Operation Bojinka were widely known within the US government. Yet Khalid Shaikh Mohammed escaped capture and later stated that the 9/11 attacks were essentially a refinement and resurrection of Bojinka. [Australian, 9/9/02] Even the fact that Mohammed would have led a resurrection of Bojinka should have been no surprise, because in 1997 the intelligence agency of Qatar, where Mohammed had been hiding, told the US that Mohammed was once again planning to hijack some planes. [UPI, 9/30/02] In June 2001, US intelligence additionally learned that Mohammed was interested in sending terrorists to the United States and planning to assist their activities there. [Los Angeles Times, 12/12/02]
http://www.historycommons.org/essay.jsp?article=essayairdefense