Let's turn to Taiwan, where investigators are learning more about the final moments of TransAsia Flight 235.
Now, they say the pilots fought to fix problems with both engines before the plane crashed.
It happened shortly after the flight took off.
Now, there were 58 people on board.
And so far, 35 people have been confirmed dead; fifteen survived, many with injuries -- that's according to Taiwan's official news agency -- eight people are still missing.
Now, one survivor says that he told some fellow passengers to unbuckle their seat belts shortly before the crash, and he believes that saved their lives.
Now, his story has caused a bit of controversy in the aviation world.
Now, CNN's Randi Kaye looks at other flights when seat belts came into play.
This is what can happen 30,000 feet above the ground --
chaos inside American Airlines Flight 280, flying this past December from South Korea to Dallas.
When the Boeing 777 dropped suddenly over Japan, passengers panicked and pulled out their cell phones to record the drama.
All of a sudden, there was just this big drop, and food and plates and service and materials, my iPhone, everything started just flying all over the place.
Some screamed, others prayed as the plane rocked.
Wine splashed on the overhead bins. Food and trash spilled into the aisles.
The plane made an emergency landing in Tokyo. Five people were taken to the hospital.
If the passengers and crew hadn't been wearing their seat belts, it could have been much worse.
The FAA says
each year approximately 58 people in the United States are injured by turbulence because they're not wearing their seat belts.
Between 1980 and 2008, the FAA recorded three fatalities
and found that two of the three were not wearing seat belts, even though the seat belt light was illuminated.
In 2013, this Singapore Airlines' flight from Singapore to London hit terrible turbulence just as flight attendants were serving breakfast.
Immediately, the "fasten seat belt" sign was turned on.
The plane reportedly dropped 65 feet, injuring 11 passengers and one crew member.
Food flew; coffee hit the ceiling.
One passenger told reporters anything that wasn't tied down hit the ceiling as the plane dropped.
Suddenly, it felt like we were in an elevator and somebody had cut the cable.
Oh, my god! Oh, it's an accident.
When Asiana Flight 214 crash-landed in San Francisco in July, 2013, two passengers were ejected from the plane.
It was later discovered they were not wearing their seat belts.
Both died, though one of them, 16-year-old Yee Meng Yuan, actually survived the crash, only to be run over by an emergency vehicle responding to the scene.
The NTSB found had those two passengers been wearing their seat belts,
they likely would have remained inside the plane and survived.
Seat belts may help passengers survive, but in some cases, they can trap them in their seats.
On Wednesday, this TransAsia Airways plane crashed into the river shortly after takeoff in Taipei.
With the cabin already chest-deep in water, rescue crews found passengers tangled in their seat belts, hanging upside down.
One 72-year-old man said he helped save four people by undoing their seat belts.
He says they would have died if he hadn't moved quickly.