<p>On 21 December 1988, Pan Am flight 103 departed London Heathrow for New York. Shortly after take-off, a bomb detonated, killing all aboard and devastating the small Scottish town of Lockerbie below. Only one man has ever been convicted of the crime: Abdelbaset al-Megrahi, though few believe that he acted alone.<br><br>In 2009, a request was made by Libya for al-Megrahi's release from prison on compassionate grounds after he had been diagnosed ...