text: This event was code-named Operation Holy Tuesday, and a neighboring nation handled diversions resulting from this event in Operation Yellow Ribbon.
full_question: This event was code-named Operation Holy Tuesday, and a neighboring nation handled diversions resulting from this event in Operation Yellow Ribbon. After this event, Article 5 of the NATO Charter was invoked for the first time. This event was planned by Khalid Sheikh Mohammed, and Mohammed Atta led a group from Hamburg in carrying out this event. During this event, some passengers on United Flight 93 were able to crash-land their aircraft in Pennsylvania, but other hijacked planes destroyed the World Trade Center. For 10 points, name this terrorist attack by al-Qaeda.
first_sentence: This event was code-named Operation Holy Tuesday, and a neighboring nation handled diversions resulting from this event in Operation Yellow Ribbon.