A mother who claimed in court that she has medical conditions making her prone to impulsive behaviour has been fined $800 after telling airport check-in staff that she had a bomb in her luggage.

Richelle Marissa Penny, 42, from Knoxfield, made the "stupid" claim at Hobart airport before boarding a Virgin Australia flight to Melbourne on December 14.

Passengers at Hobart airport Credit:Louise Kennerley

She was removed from the flight and the plane was delayed for an hour.

On Thursday she pleaded guilty in Hobart Magistrates Court to threatening to commit an act of unlawful interference with aviation.