Los Angeles: Australian model Adau Mornyang appears set to avoid a lengthy US prison sentence for attacking a flight attendant and yelling a racial slur at an air marshal during a raucous Melbourne to Los Angeles flight.

Mornyang's fate is due to be announced in an LA court on Monday.

Adau Mornyang.

The former Miss World Australia finalist had been facing up to 21 years in the US federal prison system, but prosecutors are recommending she serve just one month behind bars.

Mornyang may avoid prison altogether, with probation officers pushing for Judge Cormac Carney to sentence her to three years of probation and a $US2000 ($2849) fine.