An engineer stands in front of a C-130 HAUP of the Hellenic Air Force, which took part and is on stand by, in the searching operation of the missing Egypt plane, at the military air base of Kastelli on the southern Greek island of Crete on Friday. CAIRO -- Search crews found human remains, luggage and seats from the crashed EgyptAir jetliner Friday but face a potentially more complex task in locating bigger pieces of wreckage and the black boxes vital to determining why the plane plunged into the Mediterranean.