The puzzle over the disappearance of Malaysia Airlines Flight 370 grew even more complex Thursday when a report emerged suggesting the missing plane may have flown on for about four hours after its last reported contact.
The report from the Wall Street Journal said U.S. aviation investigators and national security officials were basing their belief that the missing plane kept flying on data automatically transmitted to the ground from the passenger jet's engines.
The newspaper attributed the information to two unidentified people who were "familiar with the details." CNN was not immediately able to confirm the report.
If the plane did indeed stay in the air for several hours after it lost contact with air traffic controllers early Saturday, the challenge facing investigators and search teams becomes immensely more complicated.
See more at CNN.com.