Did passengers on Malaysia Airlines Flight 370 try to send messages the night the plane vanished?
If they did, those final goodbyes to family members and friends could also be crucial to the investigation.
If and when the plane is found, forensic experts say personal cell phones will be key to solving one of the biggest aviation mysteries in history.
But can data be retrieved from cell phones that have been at the bottom of an ocean for more than six weeks?
CNN's Ted Rowlands is OutFront with the story.
The death toll from the capsized ferry rising tonight to 181 people - and 121 are still missing.
So why did the ship suddenly take on water?
Investigators are now taking a closer look at renovations made to the ship last year.
A South Korean politician claims the ship's owner expanded the top floor of the ferry, making room for an additional 117 passengers.
The extra weight may have shifted the center of gravity.
First distress call on S. Korean ferry from passenger, not crew, coast guard says
Officials are also looking at whether cargo was properly story in the hold.
Kyung Lah reports on the growing frustration as the search and rescue continues.
Malaysia's Prime Minister tells CNN that he will not declare Flight 370 is lost.
As officials search for answers, investigators are still focusing on the pilot and the crew.
Sumnima Udas spoke with the wife of one of the flight attendants and she has this OutFront exclusive.
A new photo may be evidence that a 15-year-old did in fact hide in the wheel well of a plane during a five-hour flight.
It shows the landing gear of the 767 aircraft where officials say the teen traveled from San Jose to Maui, surviving subzero temperatures and a lack of oxygen.
It's not the first time someone has attempted to hitch a ride on a plane, but other stowaways have been far less fortunate.
In 2010, the body of Delvonte Tisdale was found in the town of Milton, Massachusetts. It was later discovered that the 16-year-old fell from the wheel well of a passing plane, en route from Charlotte to Boston.
Delvonte's mother, Jonette Washington is OutFront.
Doctors in West Africa are struggling to stop an outbreak of one of the world's deadliest viruses –Ebola.
But the outbreak spreading fast. The virus has already claimed at least 142 lives in Guinea and Liberia.
The World Health Organization reports another hundred people have been stricken with the virus, warning it could spread further. Dr. Sanjay Gupta recently returned from the region and is OutFront.