Suicide terror-plot prisoner Sajid Badat could be free from jail next June.

The former Crypt School pupil was sentenced to 13 years behind bars in April 2005, after admitting plotting to blow up a passenger jet.

Yet if he can prove he is no longer a threat to society, he could be out by June 2010.

He plotted to bring down an airliner at the same time as shoe bomber Richard Reid targeted an American Airlines flight in 2001, but had a change of heart.

His guilty plea shocked Gloucester's Muslim community, 18 months after police raided his St James street home and found bomb-making equipment, in November 2003.

Sentenced in April 2005, he will have spent a total of six years behind bars this November.

The Ministry of Justice would not comment on the case but the 1991 Criminal Justice Act allows automatic release at the two-thirds point of the sentence, subject to probation supervision until the three quarter point of sentence. That could mean automatic release in just over two years' time.

But he has a chance of release before then – he will be eligible for consideration for parole release at the half way point of the sentence – next June.

However, he remains a high risk Category A prisoner at Full Sutton Prison, near York.

Last night a spokesman for Gloucester's Muslim community, Ahmed Bham, said they had not discussed Badat's release. "It's still some way away," he said. "As a community we have not really thought that far ahead. All that we know is what's reported in the media.

"As and when he is released, we will possibly take a view then."

A Gloucestershire police spokeswoman said: "Whenever an offender is released on licence they are supervised by the Probation Service, who would seek assistance and support from partners, including police."

One year ago Badat failed in a bid to be moved from high security status, arguing that his "wholly genuine change of heart" was accepted by the sentencing judge.

He withdrew from a plot to blow up a US-bound flight from Amsterdam. But a detonator mechanism and detonator cord were found at his home.

At sentencing the judge described the plot as "wicked and inhuman", but acknowledged Badat had renounced his extremist views and posed no continuing grave danger to society.

A Government spokeswoman said all offenders, including those convicted of terrorist offences, that are released having served a sentence of 12 months or more will be subject to probation supervision on release.