Timeline: Leads in the hunt for Malaysia Airlines Flight 370 weave drama

Timeline: Flight 370 twists and turns
Timeline: Flight 370 twists and turns

    JUST WATCHED

    Timeline: Flight 370 twists and turns

MUST WATCH

Timeline: Flight 370 twists and turns 02:51

Story highlights

  • The long list of leads in the search for Flight 370 spins a dramatic narrative
  • All of the reported objects floating in the ocean have proven to be false leads
  • The best leads have now placed the search closer to Australia's west coast
  • Has the case-breaking lead finally arrived with a discovery of a pulse signal?

Saturday's discovery of a pulse signal in the search for Malaysia Airlines Flight 370 marks yet another potential breakthrough in the mystery of the plane's disappearance.

Officials hope this lead will be unlike the others -- which so far have yet to locate the aircraft, which is believed to be at the bottom of the Indian Ocean.

But all of the past month's leads, whether genuine or false, have made for a dramatic narrative in how a commercial airliner could vanish while carrying 239 people.

March 8

Malaysia Airlines Flight MH370 takes off just after midnight from Kuala Lumpur International Airport for Beijing.

CMDR.: Consistent with both black boxes
CMDR.: Consistent with both black boxes

    JUST WATCHED

    CMDR.: Consistent with both black boxes

MUST WATCH

CMDR.: Consistent with both black boxes 02:53
PLAY VIDEO
Ship hears possible black box signal
Ship hears possible black box signal

    JUST WATCHED

    Ship hears possible black box signal

MUST WATCH

Ship hears possible black box signal 01:46
PLAY VIDEO
Did Flight 370 purposely avoid radar?
Did Flight 370 purposely avoid radar?

    JUST WATCHED

    Did Flight 370 purposely avoid radar?

MUST WATCH

Did Flight 370 purposely avoid radar? 02:39
PLAY VIDEO
nr intv william marks mh370 pinger locator review_00004307.jpg
EXPAND IMAGE

The Boeing 777-200 disappears within an hour of takeoff, following verbal communication with air traffic controllers.

Ground eyewitnesses, however, claim they saw the plane. They are an oil rig worker in the Gulf of Thailand, fishermen in Malaysia and Indonesia, and islanders in Maldives.

But all those accounts are eventually proven to be false.

March 9

A Vietnamese reconnaissance plane spots oil slicks that stretch between six and nine miles in the Gulf of Thailand, the same body of water where Flight 370 dispatched its last communication from the cockpit within the first hour of its takeoff.

The slick turned out to be fuel oil typically used in cargo ships. Meanwhile, other sightings of a plane door and its tail also prove untrue.

March 14

Citing "satellite information" and giving scant details, Malaysian officials say they are focusing their attention on two massive "arcs" on both sides of the equator.

They release a map to the press and, suddenly, the search for the plane covers a vast canvas of the Earth.

The plane could have taken either path -- which means the search area now blankets 2.97 million square miles, nearly equivalent to the size of the continental United States.

The northern arc stretches over Cambodia, Laos, China, Kazakhstan and Turkmenistan. Speculation turns toward whether the plane actually landed to the north, but officials later dismiss this arching route as the possible location of the plane. No crashes, or even a sighting of a wayward Boeing, have been reported.

Moreover, this north corridor flies through tightly guarded airspace over India, Pakistan and even U.S. military installations in Afghanistan, and no one has reported a rogue plane.

That leaves the southern arc: it stretches from Indonesia to the southern Indian Ocean.

This becomes a solid lead for investigators.

But it raises a gargantuan question: How do you find a plane in an ocean?

Crews race to trace underwater sounds
Crews race to trace underwater sounds

    JUST WATCHED

    Crews race to trace underwater sounds

MUST WATCH

Crews race to trace underwater sounds 01:27
PLAY VIDEO
Did MH370 try to avoid radar detection?
Did MH370 try to avoid radar detection?

    JUST WATCHED

    Did MH370 try to avoid radar detection?

MUST WATCH

Did MH370 try to avoid radar detection? 01:56
PLAY VIDEO
Searchers focus on three detected sounds
Searchers focus on three detected sounds

    JUST WATCHED

    Searchers focus on three detected sounds

MUST WATCH

Searchers focus on three detected sounds 02:20
PLAY VIDEO

March 18

The Thai military reveals the plane had virtually reversed course and took a sharp turn -- westward, toward the Strait of Malacca.

The Malaysian government says evidence suggest the plane was deliberately flown off-course and traveled back over the Malay Peninsula and out into the Indian Ocean.

It's another good lead in the hunt for the missing plane. The Thai information bolsters the search in the southern arc, over the Indian Ocean.

But a search of the Strait of Malacca yields nothing.

March 19

A U.S. official familiar with the investigation tells CNN that based on present search patterns and available data, it's far more likely that the plane would be located in the southern arc.

Based on U.S. data about the jet's fuel reserves, Australian authorities conduct a search about 1,600 miles off their western coast.

In fact, investigators spot two objects in the Indian Ocean that could be related to the missing plane, Australian officials say.

It's the best lead for the moment.

The Royal Australian Air Force and U.S. aircraft are sent to investigate -- but the search area is so far from land, that the planes can only search for two to three hours before they have to return to land for refueling.

Potential clues demand time.

March 22

Three days later, a land-and-sea search involving several countries continues for any sign of debris off Australia. The hunt is even taking place in outer space -- with satellite photos of the surface below.

Australian Prime Minister Tony Abbott says there's no shortage of leads -- just no results.

Teams race to sounds detected in ocean
Teams race to sounds detected in ocean

    JUST WATCHED

    Teams race to sounds detected in ocean

MUST WATCH

Teams race to sounds detected in ocean 00:53
PLAY VIDEO
Source: MH370 skirted Indonesia radar
Source: MH370 skirted Indonesia radar

    JUST WATCHED

    Source: MH370 skirted Indonesia radar

MUST WATCH

Source: MH370 skirted Indonesia radar 00:34
PLAY VIDEO
Official: Search teams detect 2nd pulse
Official: Search teams detect 2nd pulse

    JUST WATCHED

    Official: Search teams detect 2nd pulse

MUST WATCH

Official: Search teams detect 2nd pulse 02:07
PLAY VIDEO

He's optimistic, however.

"We have now had a number of very credible leads, and there is increasing hope -- no more than hope, no more than hope -- that we might be on the road to discovering what did happen to this ill-fated aircraft," Abbott says.

Still, there's no sight of the reported two parcels. Experts wonder whether the two objects were part of the junk swirling in a vast Indian Ocean gyre, or rotating currents.

March 23

France's Foreign Ministry cites radar data from a satellite showing material floating in the Indian Ocean about 1,430 miles off Perth, Australia.

In all, the satellite images by a French defense firm show 122 floating objects.

Could this be signs of the wreckage?

The problem is, they're scattered over 154 square miles, about the size of Denver, Colorado.

March 26

Search aircraft spotted three objects drifting in the sea, Australia officials say.

But search teams aren't able to locate them on subsequent passes, officials add.

It's the same story with two objects spotted by a civil aircraft. And a blue object sighted by a New Zealand military plane. None could be found again on a second pass.

If that's not enough, a Thai satellite locates 300 floating objects, including a big one measuring 50 feet by 6 feet, Thai officials say. They are just 125 miles from the French satellite's sighting of 122 objects.

Then, the Japanese government says one of its intelligence satellites identified 10 floating objects, the largest of which is 13 feet by 26 feet. They're also floating near the other satellite sightings, some 1,550 miles off western Australia.

There are so many leads, it's dizzying.

Perhaps the day's most dispiriting news is that crews can't find a 75-foot-long object that was captured in satellite images provided by Airbus Defence and Space. Could it have been part of the plane's wing, experts asked?

The only good news is there's no shortage of potential clues.

The bad news is, nothing comes of them.

March 27

The search moves to a different patch of the ocean -- 680 miles northeast of the primary area of focus -- because of "a new credible lead" provided by Malaysian investigators, Australian officials say.

The new information is based on an analysis of radar data on the day the plane disappeared and suggests the aircraft was traveling faster than previously estimated before it dropped off radar, the Australian Maritime Safety Authority said.

This means the plane burned fuel faster, shortening its maximum possible distance over the southern Indian Ocean.

The advantage is the search moves closer to the Australian coast, making the area easier for planes to reach. Jets can now spend more time searching.

March 28

Aircraft spot possible debris in the new search field.

In fact, CNN's Kyung Lah is embedded aboard a New Zealand military plane that sights 11 small objects drifting at sea.

"At one point, sure, everybody on board got a little excited, but it's impossible to tell from that distance what anything is," she says.

But it's the same story: a dead end.

March 29

A Chinese war ship and a second vessel retrieve objects from the ocean, Australian officials say.

Also, a Chinese plane crew drops buoys to mark three suspected debris sites, China's state-run media reports.

But they're all blind alleys leading to nowhere. Some of the objects retrieved by the ships were merely fishing gear.

March 30

Australian aircraft put an eye on four orange items bobbing in the water. Crews take photos and send back coordinates. One item is 6.5 feet long.

The discovery become one of the "most promising leads" in the new search area, says Australian Flight Lt. Russell Adams.

But it ends as a hope dashed. The promise doesn't deliver.

Australian Prime Ministry Tony Abbott stands undaunted, however.

"We are searching a vast area of ocean, and we are working on quite limited information. Nevertheless, the best brains in the world are applying themselves to this task," Abbott says. "If this mystery is solvable, we will solve it."

The search, however, is now approaching its fourth week.

April 2

Under growing criticism at home, Malaysian Prime Minister Najib Razak pledges to get to the bottom of the plane mystery -- if not the ocean itself.

"We want to provide comfort to the families, and we will not rest until answers are indeed found," he says.

The mission, however, could last longer than initially thought.

"We'll keep going til hell freezes over," Kim Beazley, Australia's former defense minister and current ambassador to the United States, tells CNN. "It could take months, it could take years."

April 4

Time is running out.

The plane's black box -- the cockpit voice and flight data recorders -- has enough battery life to last 30 days, at most.

After 30 days, the black box's locator beacons -- known as pingers -- will die.

In other words, the plane will no longer be able to make an electronic cry for help.

We're now on Day 28.

Saturday, April 5

Crews are now searching for the plane on a prayer that the pingers will last long enough for search teams to find them.

Will that miracle arrive?

As if a godsend, a pulse is heard rising from the Indian Ocean by a Chinese ship in the search area, Australian officials say.

The pulse carries the same standard beacon frequency as the black box: 37.5 kHz, according to a China Central Television correspondent aboard the Haixun-01 (pronounced "high shuen").

The Chinese ship heard it for a minute and a half but couldn't record it, a Shanghai-based Communist Party newspaper reports.

After so many false starts, has the revelatory lead finally arrived?

It's not out of the question, experts say.

READ: Lucrative China-Malaysia relations not derailed by search for MH370

READ: Relatives react cautiously to possible Malaysia Airlines clue

READ: Wife of Flight 370 passenger: 'I needed to know they were looking for Pauly'

      Malaysia Airlines Flight 370

    • nr intv moni basu husbands quiet suffering flight 370_00020822.jpg

      An empty space on earth

      His wife never came home from her flight on MH370, and now K.S. Narendran is left to imagine the worst of possible truths without knowing.
    • This handout photo taken on April 7, 2014 and released on April 9, 2014 by Australian Defence shows Maritime Warfare Officer, Sub Lieutenant Ryan Penrose watching HMAS Success as HMAS Perth approaches for a replenishment at sea while searching for missing Malaysia Airlines flight MH370 in the southern Indian Ocean. Two fresh signals have been picked up Australian ship Ocean Shield in the search for missing Malaysian flight MH370, raising hopes that wreckage will be found within days even as black box batteries start to expire.

      Is this the sound of the crash?

      Was the sound of Malaysian Airlines Flight MH370 striking the water captured by ocean devices used to listen for signs of nuclear blasts?
    •  A crew member of a Royal New Zealand Airforce (RNZAF) P-3K2-Orion aircraft helps to look for objects during the search for missing Malaysia Airlines flight MH370 in flight over the Indian Ocean on April 13, 2014 off the coast of Perth, Australia. S

      Search back to square one

      What was believed to be the best hope of finding the missing plane is now being called a false hope. Rene Marsh explains.
    • Caption:A Chinese relative of passengers on the missing Malaysia Airlines flight MH370 uses a lighter as she prays at the Metro Park Hotel in Beijing on April 8, 2014. The hunt for physical evidence that the Malaysia Airlines jet crashed in the Indian Ocean more than three weeks ago has turned up nothing, despite a massive operation involving seven countries and repeated sightings of suspected debris. AFP PHOTO/WANG ZHAO (Photo credit should read WANG ZHAO/AFP/Getty Images)

      Bring in the lawyers

      Involved parties, including the manufacturer Boeing, are bracing for a long public relations siege.
    • The painstaking search for Malaysia Airlines Flight 370 got a vote of confidence Friday that the effort is headed in the right direction, but officials noted that much work remains.
Credit: 	CNN

      Pings likely not from Flight 370

      Official: The four acoustic pings at the center of the search for Flight 370 are no longer believed to have come from the plane's black boxes.
    • INDIAN OCEAN (April 14, 2014) -- Operators aboard ADF Ocean Shield move U.S. Navy's Bluefin-21 into position for deployment, April 14. Using side scan sonar, the Bluefin will descend to a depth of between 4,000 and 4,500 meters, approximately 35 meters above the ocean floor. It will spend up to 16 hours at this depth collecting data, before potentially moving to other likely search areas. Joint Task Force 658 is currently supporting Operation Southern Indian Ocean, searching for the missing Malaysia Airlines Flight 370. (U.S. Navy video by Mass Communication Specialist 1st Class Peter D. Blair/RELEASED)

      Underwater search on hold

      The underwater search for the missing Malaysia Airlines plane will effectively be put on hold this week, and may not resume until August at the earliest.
    • Movie-makers say they have recruited leading Hollywood technicians to bring their experience to mid-air flight sequences.

      An MH370 movie already?

      Movie-makers in Cannes have announced they're making a thriller based on the disappearance of Malaysian flight MH370.
    • The story of the search

      The search for the missing Boeing 777 has gone on for eight weeks now. CNN's David Molko looks back at this difficult, emotional assignment.