Is 'Transmission of the Authorization from the White House to the Pilots The NMCC learned of United 93's hijacking at about 10:03.' a fitting logical lead-up to 'The NMCC heard about the hijacking of United 93 at 9:15, before anyone else.'
Transmission of the Authorization from the White House to the Pilots The NMCC learned of United 93's hijacking at about 10:03.###The NMCC heard about the hijacking of United 93 at 9:15, before anyone else.