Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - It's a mystery that authorities still haven't been able to solve: Where is Malaysia Airlines Flight 370?
There were still more questions than answers Thursday as U.S. officials said investigators might start combing the Indian Ocean in their search for the missing aircraft.
Why would authorities expand their search rather than narrowing it?
New information, U.S. officials told CNN, indicates the missing airplane could have flown for several hours beyond the last transponder reading.