Questions remain unanswered despite huge search efforts

Lt. j.g. Kyle Atakturk (L) and Lt. j.g. Nicholas Horton, naval aviators attached to Patrol Squadron (VP) 16, pilot a P-8A Poseidon during a mission over the Indian Ocean to assist in search and rescue operations for Malaysia Airlines flight MH370 in this picture released by the US Navy March 19, 2014.[Photo/Agencies]