Watch Why Planes Vanish: The Hunt for MH370 (370) HD Full Movie Free on SolarMovie. Watch Why Planes Vanish: The Hunt for MH370 (370) online free. Documentary examines new radio tech potentially locating MH370 wreckage after 2014 disappearance, an...Documentary examines new radio tech potentially locating MH370 wreckage after 2014 disappearance, and explores aviation safety improvements prompted by the incident.