The last of the planes carrying passengers from the Australian state of New South Wales crashed into the ocean in the remote Australian town of Woomera in the middle of the night on Thursday.
The crash came a day after a flight carrying around 20 passengers from Tasmania crashed in the Australian Capital Territory, killing all but one person on board.
More than 600 people are believed to have been on board the flight, which was on its way from Darwin to Adelaide when it crashed into a coral reef on the coast of the Northern Territory on Thursday morning.
It was the second major disaster in the state this year.
A fourth plane was also carrying passengers in the same area when it was shot down by a Japanese fighter plane over the Pacific Ocean in January.
On the morning of Thursday, a helicopter crashed into one of the beaches of Woorawa in the country’s far north, killing a young woman on board and wounding several others.
An Australian Government investigation found that the aircraft, a Boeing 737-700, had flown more than 2,000 kilometres (1,867 miles) without any navigational aids, and was in a poor condition when it struck the reef.
After a firefighting operation was launched, more than 20 firefighters from Woorewa, who had been in the area for a week, were forced to leave the area after finding themselves on the wrong side of the road.
Two helicopters and an aerial search operation were also called in.
Authorities have also issued an urgent call for more resources and assistance to the Australian Defence Force.
“A search and rescue operation has been launched by the NSW Ambulance Service and the Australian Maritime Safety Authority to assist in the recovery of people from the scene,” a spokesman for the Australian Department of Defence said.
He said it was expected to take several days for the body of the plane to be recovered.