A grainy sonar image captured off an uninhabited tropical island in the southwestern Pacific republic of Kiribati might represent the remains of the Electra, the two-engine aircraft legendary aviator Amelia Earhart was piloting when she vanished on July 2, 1937 in a record attempt to fly around the world at the equator.

Released by The International Group for Historic Aircraft Recovery (TIGHAR), which has long been investigating Earhart's last, fateful flight, the images show an "anomaly" resting at the depth of about 600 feet in the waters off Nikumaroro island, some 350 miles southeast of Earhart's target destination, Howland Island....