There were 23 US marines on board the Osprey aircraft when it crashed on one of the Tiwi Islands about 9.30am on Sunday during a military exercise.
Twenty were flown to Royal Darwin Hospital after the crash while three were killed.
There are still three in hospital.
Those were were able to attend took part in a memorial held by the local RSL in Darwin overnight, where wreaths were laid and candles lit.
Locals also attended, including Faye Smith, who called the incident “incomprehensible”.
“It was just such a terrible tragedy, so many young lives,” she said.
Meanwhile, the bodies of the three Marines killed in the crash are expected to be recovered today.
Their identities are yet to be confirmed.
In the meantime, officials have given their condolences to the families of those affected.
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“Jill and I send our deepest condolences to the families of the Marines who lost their lives in this deadly crash,” US President Joe Biden said.
“We are praying for those who also suffered injuries.”
Prime Minister Anthony Albanese said his heart and the hearts of all Australians go out to the families of the marines who lost their lives and those injured.
“At a time like this, we reach out to our American brothers and sisters to express our condolences to them, our commitment to continue to work with them,” he said.
“This is a difficult time for families, friends and all of the US defence personnel.”
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US ambassador to Australia Caroline Kennedy also released a statement yesterday.
“I’ve spoken with Marine leadership on the ground, and let them know that our embassy and consulates will continue to provide the support and help they and the families need,” she said.
“To those who have been injured, we hope you return to good health as soon as possible. Your courage inspires us all.”