Khaled Khayat, 52, and Mahmoud Khayat, 34, were found guilty earlier this year of conspiring to prepare or plan a terrorist act between January and July 2017.
The plot, which included their older brother Tarek Khayat who fought for Islamic State in Syria, involved blowing up the plane and carrying out a lethal poisonous gas attack.
A bomb hidden in a meat grinder was to be put into the luggage of the unsuspecting Amer Khayat who was flying to Abu Dhabi.
But the plan was abandoned when the baggage was found to be overweight at Sydney airport.
Khaled was sentenced today to 40 years in jail for the plot, while his brother Mahmoud was sentenced to 26 years, according to the ABC.
— Jamie McKinnell (@jamie86) December 17, 2019
Michael Finnane QC, representing Mahmoud Khayat, earlier told Justice Christine Adamson she should consider imposing a non-custodial sentence or a jail term less than a year on his client.
He had been approved for Australian citizenship but had not taken it out, meaning if he received a sentence of more than a year he would be considered for deportation to Lebanon.
Khaled Khayat’s barrister, Richard Pontella, submitted it was not open for a life sentence to be imposed on his client, for reasons including the many details he gave to police when he was first interviewed.
A police officer had testified he “was absolutely a valuable source of information”, disclosing previously unknown salient features of the plot, Mr Pontella said.
The judge was told both brothers maintained their innocence, but embarrassment or shame could be behind this.
But she commented they “belong to a family where at least two of its members were killed in the course of violent jihad, that was an occasion for, if not celebration, glorification of those who had died as martyrs”.
“But on one view of what these two men did, and were convicted of, was what those who can’t go and fight in Syria are supposed to do in their home countries, namely commit terrorist acts to advance the cause of Islamic State.”
Amer Khayat was found not guilty in September by a military court of the bomb plot, after spending more than two years in a Lebanese prison.
But the Lebanese court found Tarek Khayat guilty, and sentenced him to hard labour for life over the plot.