From the main menu go to Sneek Peaks. Now press left on the remote. The t.v screen on the back of one of the seats will now light up. Press enter. You will see what the passengers would have seen on the flight, telling them where the flight was headed and other information.
From the main menu go to bonus features. Now go to The In Flight Movie: The Making of Flightplan. Now go down to D-Connecting Flights Post Production; but don't hit enter. Now press left on the remote. An arrow inside a circle should be highlighted. Now hit enter and you should see a segment about a problem that occured during production involving homeland security.
All easter eggs were generously submitted by black6q