CABRERA: It's one of the biggest mysteries in modern aviation history. And it hardly seems possible that in the age of instant communications and high-tech aviation systems a Boeing 777 could simply vanish on a routine flight, but it did one year ago tomorrow. Our Anna Coren is in Kuala Lumpur where grieving families are marking the slumber occasion.</s>ANNA COREN, CNN CORRESPONDENT: Ana, as the families of the 239 people onboard MH 370 prepare to commemorate the one-year anniversary since the plane's disappearance. The CEO of Malaysia airlines says the search must continue because the world deserves answers as to what really happened.</s>UNIDENTIFIED MALE: I wish that, you know, we will carry on looking for the aircraft. You know, I think the world needs an answer. The family needs answer as well.</s>COREN: More than 40 percent of the search area in the Southern Indian Ocean has been covered and authorities are confident that the four ships scouring the ocean floor with sonar equipment looking for the wreckage will be finished by may. Meantime, the airline's chief has defended the pilot of MH-370, captain Zaharie (ph) claiming he was responsible for the plane's disappearance are baseless and mere speculation.</s>UNIDENTIFIED MALE: Speculation. We do not suspect any one of our crew until it is evident. Captain</s>COREN: He also says that valuable lessons have been learned from the MH-370 tragedy with the airline stepping up the protocol and its flight tracking system -- Ana.</s>CABRERA: Thank you, Anna Coren again in Kuala Lumpur. Tonight CNN will look at this mystery behind the vanished flight in a Special Report. That's at 9:00 p.m. eastern. Next, the fallout over Hillary Clinton's email causing a rift among Democrats and the controversy continues. Did Democrats put all their eggs in one basket? Should they have a plan "b" for 2016 or will this just blow over? That debate next.
One-Year Anniversary Of Missing Malaysia Airline Flight 370 On The Horizon