Analysis shows two possible Indian Ocean paths for airliner

Washington (CNN) -- Malaysia Airlines Flight 370 made drastic changes in altitude and direction after disappearing from civilian radar, U.S. officials told CNN on Friday, raising questions for investigators about just who was at the controls of the commercial jetliner that went missing one week ago with 239 people on board.

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Malaysia Airliner Communications Shut Down Separately, US Officials Say

Two U.S. officials tell ABC News the U.S. believes that the shutdown of two communication systems happened separately on Malaysia Airlines Flight 370. One source said this indicates the plane did not come out of the sky because of a catastrophic failure.

The data reporting system, they believe, was shut down at 1:07 a.m. The transponder -- which transmits location and altitude -- shut down at 1:21 a.m.

This indicates it may well have been a deliberate act, ABC News aviation consultant John Nance said.

U.S. investigators told ABC News that the two modes of communication were "systematically shut down."

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