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) - Air traffic controllers assumed that Malaysia Airlines Flight 370 had turned back from Malaysia because of mechanical trouble, according to Reuters.
If that is true, they did not follow proper protocol, and if they had, "we wouldn't even be talking about this today," says CNN aviation analyst and pilot Miles O'Brien discuss.
"There was a narrow window there to stop this whole thing from happening," said O'Brien.
For more analysis from O'Brien, alongside former Navy oceanographer Van Gurley, and CNN safety analyst and author of "Why Planes Crash" David Soucie, click on the video above.