After three days of the plane crash, the Digital Flight Data Recorder or black box of the ill fated Air India Boeing 737 plane has been recovered from the crash site this morning. 158 people were killed in the plane crash in Mangalore on Saturady.<br/>DGCA offcials displayed the black box before the media at the crash site. Our correspondent reports that the black box will be sent to Delhi for investigation. The flight data recorder will help in ascertaining the cause of crash.<br/>Meanwhile, Samples of 22 bodies of plane crash sent to Hyderabad for DNA test by special flight yesterday. Report is expected within a week<br/><br/>