Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
A look at Obama's immigration plan. Plus, how long Takata knew of problems with its airbags.
(CNN) – Almost a month after Malaysia Airlines Flight 370 disappeared, searchers say pulse signals detected in the Indian Ocean provide the best hope so far for finding it.
However, those same officials warn it will take time to confirm if the sonar pings come from the missing plane, meaning nothing is certain yet.
The new information raises more questions about what the pulse signals mean, and what happens now.
CNN aviation analyst Miles O'Brien and submersible specialist and president of Tiburon Subsea Services Captain Tim Taylor discuss.