21 Days and Counting: Your Missing Plane Questions

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Twenty-one days after the mysterious disappearance of Malaysian Airlines Flight 370, the search area has shifted 680 miles northeast of where a multinational team of investigators had been looking because of a "new credible lead," Australian authorities said Friday. Were the last eight days squandered? Are they zeroing in on the plane? What's next?

NBC News hosted a live interactive webcast at 1:15 p.m. ET on Friday, hosted by Anne Thompson and including Tom Costello and former NTSB investigator Greg Feith.

Users submitted questions using the hashtag #AskNBCNews on Facebook and Twitter. If you misse it, the video will is available on-demand above.