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The daughter of people who gunned down two police officers and a neighbour at a rural property says NSW Police didn't warn the Queensland force of their mistrust of police.

Stacey, Gareth and Nathaniel Train killed Constables Rachel McCrow and Matthew Arnold and neighbour Alan Dare at a Wieambilla residence, three hours west of Brisbane, on December 12.

The offenders died in a gunfight later that night with specialist police.

Madelyn Train, the biological daughter of Nathaniel and Stacey, told Nine News on Monday she missed a call from a police officer in Walgett in northern NSW on the day of the killings.

Ms Train said no officers should have been sent to the property until police had relevant background information.

She said Nathaniel Train's wife Vanessa had told NSW authorities of the group's mistrust of police.

"They were contacting us to ask if Nathaniel was missing and to get contextual information but they never should have sent anyone there until they got all the contextual information," she said.

"(Vanessa) had told the police officers that there was a mistrust of police, like Gary (Gareth) had a mistrust of police, and then the NSW Police Force apparently did not disclose that to the Queensland Police Force."

Queensland Police said at the time of the shooting they knew little about the Trains and there was nothing that would have raised particular concerns for officers on the day.

Madelyn Train earlier told Nine News her mother didn't like guns.

Ms Train was raised by her "uncle Gary" (Gareth), who she called dad after Stacey married him following her divorce from Nathaniel.

"They were the gentlest people I know," Ms Train told Nine News on Sunday.

Ms Train said there was nothing to indicate they would commit the mass shooting but her "dad", Gary, did hold extreme views.

Ms Train said the three were "influenced by fear" in committing the shootings.

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© AAP 2023

Authorities are yet to establish a motive after a gunman killed 10 people at a Los Angeles-area ballroom dance club during Lunar New Year celebrations, sending a wave of fear through Asian American communities and casting a shadow over festivities.

The suspect was found on Sunday, dead of a self-inflicted gunshot wound in a van in which authorities say he fled after people thwarted his attempt at a second shooting Saturday night.

The massacre was the nation's fifth mass killing this month.

It was also the deadliest attack since May 24, when 21 people were killed in an elementary school in Uvalde, Texas.

Los Angeles County Sheriff Robert Luna identified the man as 72-year-old Huu Can Tran and said no other suspects were at large.

Luna said the motive remained unclear for the attack, which wounded 10 people, seven of whom were still hospitalised.

Speaking at a Sunday evening news conference, the sheriff said he didn't have their exact ages but all of the people killed appeared to be aged more than 50.

The suspect was carrying what Luna described as a semi-automatic pistol with an extended magazine, with a second handgun discovered in the van where Tran died.

Monterey Park Police Chief Scott Wiese said on Sunday officers had arrived at the Star Ballroom Dance Studio in Monterey Park within three minutes of receiving the call.

There, they found carnage inside and people trying to flee through all the doors.

"When they came into the parking lot it was chaos," Wiese said.

About 20 to 30 minutes after the first attack, the gunman entered the Lai Lai Ballroom in the nearby city of Alhambra.

But people wrested the weapon away from him and witnesses said he fled in a white van, Sheriff Luna said.

The van was found in Torrance, another community home to many Asian Americans, about 34.5 kilometres from that second location.

After surrounding the vehicle for hours, law enforcement officials swarmed and entered it.

A person's body appeared to be slumped over the wheel and was later removed.

Members of a SWAT team looked through the van's contents before walking away.

The sheriff's department earlier released photos of an Asian man believed to be the suspect, apparently taken from a security camera.

Congresswoman Judy Chu said she still has questions about the attack but hopes residents now feel safe.

"The community was in fear thinking that they should not go to any events because there was an active shooter," Chu told Sunday's news conference.

"What was the motive for this shooter? Did he have a mental illness? Was he a domestic violence abuser? How did he get these guns and was it through legal means or not?"

Monterey Park, a city of about 60,000 people on the eastern edge of Los Angeles, is composed mostly of Asian immigrants from China or first-generation Asian Americans.

The shooting happened in the heart of its downtown where red lanterns decorated the streets for the Lunar New Year festivities - one of California's largest celebrations.

Two days of festivities, which have been attended by as many as 100,000 people in past years, were planned but officials cancelled Sunday's events following the shooting.

President Joe Biden and Attorney General Merrick Garland were briefed on the situation, aides said.

Biden said he and first lady Jill Biden were thinking of those killed and wounded and directed federal authorities to support the investigation.

A USA Today/Associated Press database on mass killings in the US shows 2022 was one of the nation's worst years with 42 such attacks - the second-highest number since the creation of the tracker in 2006.

The database defines a mass killing as four people killed, not including the perpetrator.

© RAW 2023

Australian travellers heave endured delays as airline arrivals and departure times slumped below average over the festive season.

Government data for domestic on-time performance in December 2022 shows arrival and departure times were significantly lower than the long-term average performance for all routes across the country.

The December report card reveal on-time performance dropped to 71.1 per cent for arrivals and 70.8 per cent for on-time departures.

The performance was significantly lower than 2021 results of 84.2 per cent for on-time arrivals and 83.2 per cent for departures, according to the report by the Bureau of Infrastructure and Transport Research Economics.

The figures also show a 3.4 per cent cancellation rate for the month.

Qantas achieved the highest number of on-time arrivals of major domestic airlines at 73.0 per cent, followed by Virgin Australia at 67.3 per cent and Jetstar at 62.0 per cent.

Of the regional airlines, QantasLink recorded 78.4 per cent for on-time arrivals, followed by Rex Airlines at 73.2 per cent and Virgin Australia Regional Airlines at 69.9 per cent.

Jetstar recorded the highest rate of cancellations at 7.2 per cent, followed by Virgin Australia Regional Airlines (5.0 per cent), Virgin Australia (3.4 per cent), Qantas (2.9 per cent), QantasLink (2.5 per cent) and Rex Airlines (0.7 per cent).

Of the 60 routes within the criteria for on-time performance reporting in December 2022, the Adelaide-Canberra route had the highest percentage at 90.2 per cent, and the highest percentage of on-time departures (89.2 per cent).

One of the worst-performing routes was Darwin-Perth, with on-time arrivals of 50 per cent and the lowest percentage of on-time departures at 46.2 per cent.

Cancellations were highest on the Sydney to Melbourne route at 9.3 per cent, followed by Melbourne to Sydney (9.1 per cent), Sunshine Coast-Sydney (8.1 per cent), Sydney-Canberra (7.1 per cent) and Canberra-Sydney (6.8 per cent).

© AAP 2023