Terror Plotter Says 'Sorry' Over Curtis Chang's Death, No Longer Supports ISIS

A young Sydney man who saluted Islamic State as he was sentenced for aiding a terrorist act has told a court he wants a shorter jail term and no longer supports terrorist organisations.

Raban Alou sourced the loaded gun used by Farhad Jabar -- also referred to as Farhad Mohammad -- to kill accountant Curtis Cheng outside NSW Police headquarters in October 2015.

The 58-year-old father of two died instantly before the 15-year-old killer was shot dead by police.

A woman holds an order of service for Curtis Cheng after his funeral service at St Mary's Cathedral, Sydney. Image: AAP

Alou, described as an active planner of the attack, was sentenced in March 2018 to 44 years in prison, with a non-parole period of 33 years.

Before his sentencing, he was recorded saying he'd never say sorry but on Wednesday -- while seeking leave to appeal his sentence -- the 22-year-old apologised for the attack.

"(I have) remorse. I'm sorry. I've done wrong," he told the NSW Court of Criminal Appeal.

"I wish I could take it back. I didn't know better. I should've but I didn't. I thought it was the right thing."

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Alou said he changed allegiance from Islamic State to al-Qaeda while in prison but had not supported any particular organisation for the past eight months.

"I don't know much about (al-Qaeda). If I do see something good in them I will support them," he said while under cross-examination.

Challenged by Chief Justice Tom Bathurst to define "good", the Goulburn supermax inmate said he could support a branch of al-Qaeda backed by western groups fighting the Assad regime in Syria.

Selina Cheng, the wife of Curtis Cheng, is overcome with emotion after the funeral of her husband. Image: AAP

Alou rejected on several occasions the suggestion that he was lying to the court to have his sentence reduced.

Earlier, he declined to stand as the three appeal judges entered the courtroom and instead sat with his head bowed.

He said he didn't agree with the view of the Australian National Imams Council that standing and bowing to a judge is permitted in Islam.

"If they provide proof stronger than what I have heard, I will stand," he said.