Administration officials say they have information that the plane’s engines remained running for approximately four hours after it disappeared from radar. The officials also acknowledged that they did not know what direction the plane flew — or whether it simply circled — over that time or whether it was airborne at all. But four hours of additional flight could have put the plane somewhere over the Indian Ocean, prompting U.S. officials from considering expanding the search into that area. This graphic was last updated on Friday, March 14. READ: Search expands into Indian Ocean

Sources: Boeing.com, Flightaware.com, the Aviation Herald and news reports | LARIS KARKLIS AND RICHARD JOHNSON/THE WASHINGTON POST