Is it a very spread out debris field, which would suggest an aircraft coming apart in flight?" Mostafa Ezzo (right) with his friend Mohamed Mamdouh (left), believed to be the co-pilot aboard EgyptAir flight 804. "Is it a tight field, which would indicate the aircraft went in vertically? "And then the length of the field, and then of course the debris — one looks at the chemical composition of the debris." While investigators search for answers, aviation experts have focused on the plane's unusual actions just prior to losing contact.

Source: CBC News May 19, 2016 21:18 UTC