Scan the QR code on the 'Redacted Interrogation Video'.
At the end of the video, the interrogator hands Ms. Carey his card. Do the symbols look familiar?
These symbols should be used in conjunction with the Pilot's Log Book that was found in the briefcase.
A grid can be found on the opening page of the pilot's log. Figure out the value of each symbol.
Use the values from the grid to determine the code based on the symbols that were shown at the end of Ms. Carey's interrogation.