Conversation so far:
When did Khalid Sheikh Mohammed renew his relationship with bin Laden?
Did he actually meet bin Laden in person?
Where did they meet?
What resulted from Khalid meeting bin Laden?
When did Khalid and bin Laden create the plans for the hijacking?

Question: Did Khalid work with anyone else in his planning?
Self-contained rewrite: Did Khalid work with anyone else in his planning?