Officials are clarifying the last voice transmission from the cockpit.  Malaysia's Department of Civil Aviation says the final words heard by air traffic control from the doomed flight were "Good night Malaysian three seven zero."  It had previously been reported that the last transmission was "Alright, goodnight."  Investigators are still trying to determine whether those last words from the cockpit were spoken by the pilot or co-pilot.  

There are still few clues to the location of the missing jet.  Nineteen ships and plan are involved in today's search for in the southern Indian Ocean.  Though experts fear that the batteries transmitting a signal from the plane's black box will soon fail, searchers may have a few extra days before the power fails.  

Underwater search expert Colleen Keller says the black box is designed to ping for 30 days but the batteries could hold out for another ten days.

The search for Malaysia Airlines Flight 370 could drag on for a long time.

"It will take time.  It's not something that's necessarily going to be resolved in the next two weeks, for example," said Angus Houston.

Houston is head of the agency coordinating the search.  He says they have not recovered anything connected to the flight, and when they do,

"That will change the whole nature of our search because we'll then be able to deploy high technology to assist us to the underwater part of the search."

He adds the caveat that they need to find debris before they can begin that search under water.

Ed and Amy spoke with CBS correspondent Steve Futterman live from Kuala Lumpur Tuesday morning: