A flight data file created by the downloaded Flight Data Recorder information of American Airlines flight 77 was created on Thursday, September 13, 2001 at 11:45pm.

However, as reported by USA Today, Pentagon spokesman Army Lt. Col. George Rhynedance reported that the FDR for AA 77 was recovered on Friday, September 14, 2001 at 4am, 4 hours and 15 minutes after the creation of the AA 77 FDR data file.

WASHINGTON (AP) — Searchers on Friday found the flight data and cockpit voice recorders from the hijacked plane that flew into the Pentagon and exploded, Department of Defense officials said. The two "black boxes," crucial to uncovering details about the doomed flight's last moments, were recovered at about 4 a.m., said Army Lt. Col. George Rhynedance, a Pentagon spokesman.

http://www.usatoday.com/news/nation/2001/09/14/pentagon-fire.htm

The AA 77 FDR file was contained within a May 2008 release obtained through a Freedom of Information Act request of the National Transportation Safety Board.