Heartbreaking final message from mother and her children as they boarded doomed ...

The heartbreaking final messages of passengers on the doomed Indonesian plane which crashed into the sea with 62 people on board have been revealed, as rescuers have located two black boxes.

Sriwijaya Air Flight 182 took off from Soekarno-Hatta international airport for a 90-minute flight over the Java Sea between Jakarta and Pofntianak in West Kalimantan. 

But at 2.40pm - just four minutes after takeoff - the Boeing B737-500 plunged nearly 10,000ft in less than 60 seconds, with witnesses claiming they heard two explosions. 

Soerjanto Tjahjanto, head of Indonesia's transport safety agency, said authorities have found the two black boxes in the sea and divers are now trying to retrieve them, along with body parts and plane wreckage.

It comes as the tragic final messages and posts have been revealed as they shared photos on the plane before the crash.

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Ratih Windania posted a selfie with her three children laughing as the family boarded the plane.

She said: 'Bye bye family. We're heading home for now.'

Ratih Windania posted a selfie with her three children laughing as they boarded a plane in Indonesia on Saturday

Ratih Windania posted a selfie with her three children laughing as they boarded a plane in Indonesia on Saturday

Rescuers have discovered body parts and pieces of clothing during a desperate search for Sriwijaya Air Flight 182

Rescuers have discovered body parts and pieces of clothing during a desperate search for Sriwijaya Air Flight 182

The message was sent just before they boarded the plane from the Indonesian capital.

'Pray for us,' her brother Irfansyah Riyanto posted on Instagram with a picture of the family. 

He said his family were originally planning to take a different flight but they changed at the last minute.

Transportation Minister Budi Karya Sumadi on Sunday said authorities launched a widespread search for the Boeing 737-500 after narrowing down 'the possible location of the crash site'

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Transportation Minister Budi Karya Sumadi on Sunday said authorities launched a widespread search for the Boeing 737-500 after narrowing down 'the possible location of the crash site'

The Boeing B737-500 plunged nearly 3,300 metres in less than 60 seconds to an altitude of just 75 metres. Pictured: debris discovered in the ocean

The Boeing B737-500 plunged nearly 3,300 metres in less than 60 seconds to an altitude of just 75 metres. Pictured: debris discovered in the ocean 

Like dozens of other desperate relatives, Irfansyah rushed to Jakarta's Soekarno Hatta airport late on Saturday. On Sunday, he was still hoping for good news about his sister and four other family members on the flight, including his parents.

'We feel powerless, we can only wait and hope to have any information soon,' Irfansyah told reporters.

Irfansyah said his relatives had originally been due to take an earlier flight operated by Sriwijaya's unit NAM Air and he was unclear why that was changed.

His sister and her two children had been at the end of a three-week holiday and were taking the 740 km (460 mile) trip home to Pontianak on the island of West Kalimantan.

'I was the one who drove them to the airport, helped with the check-ins and the luggage ... I feel like I still can't believe this and it happened too fast,' Irfansyah said.

Irfansyah said his relatives (pictured at the airport) had originally been due to take an earlier flight operated by Sriwijaya's unit NAM Air and he was unclear why that was changed

Irfansyah said his relatives (pictured at the airport) had originally been due to take an earlier flight operated by Sriwijaya's unit NAM Air and he was unclear why that was changed

A medical officer sprays disinfectant onto the washed up debris as rescuers desperately search for survivors

A medical officer sprays disinfectant onto the washed up debris as rescuers desperately search for survivors

Police asked families to provide information to help identify any bodies retrieved such as dental records and DNA samples.

At the police hospital, the brother of co-pilot Diego Mamahit said he had been asked for a blood sample.

'I believe my younger brother survived, these are just for the police procedure,' Chris Mamahit said. 'Diego is a good man, we still believe Diego survived.'

On his LinkedIn profile, Mahamit had written 'I really love to fly.'

A plane flies over Indonesian search and rescue teams scattered in several points as they look for debris

A plane flies over Indonesian search and rescue

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