The heartbroken wife of an American airman killed in a firefighting plane crash in southern NSW has given her deepest thanks to the people of Australia.
Captain Ian McBeth, first officer Paul Clyde Hudson and flight engineer Rick DeMorgan Jr were killed when their C130 water-bombing tanker crashed northeast of Cooma on January 23.
Rebekah DeMorgan was among hundreds who paid tribute to the sacrifices of her husband and other firefighters during a state memorial service at Sydney Olympic Park on Sunday.
She travelled from the United States with her children Lucas and Logan Grace.
"The service was very nice and the country has been phenomenal in the way it has supported us," she told AAP.
"There's been lots of love and support. The people that have supported us over here, we can never thank them enough."
Volunteer firefighters from across the state travelled to the memorial in Sydney in a display of solidarity.
Hawkesbury firefighter Noel Eather came to the memorial with his son Luke, also an RFS volunteer.
"We are here to show some respect for the lives that were lost," he told AAP.
"I lost a cousin in a bushfire at Lithgow years ago so this is pretty close to home for me.
"I've been with the RFS for 27 years. It's like one big family."
Dunmore RFS brigade deputy captain Ian Cox travelled to the memorial with a crew from Illawarra.
"We are here out of respect for those that lost their lives," he told AAP.