A MOTHER has demanded an apology and threatened to sue an airline after she claimed she was labelled a security risk on a plane.

Bindu Kalton, who is four months pregnant, says she was told to use a toilet away from the cockpit because a stewardess said she could have threatened passengers' safety.

On Friday the 24-year-old housewife claimed that the toilet had not been cordoned off and that other passengers had been allowed to use the facility.

"I just wanted to use the loo like everyone else," said Mrs Kalton, 24.

But yesterday (Tuesday) a spokesman for bmibaby said the toilet had been cordoned off by a curtain because the flight deck door was open.

"Any passenger approaching the forward galley or wishing to use the toilets and washroom facilities are asked to use the ones at the rear of the aircraft," said the spokesman.

The couple had been returning to their home in Tatton Stile, Mobberley, after more than two weeks on holiday in Malaga with their two-year-old son Tyler.

On Friday Mrs Kalton alleged the stewardess had become confrontational and paranoid when she went to the nearest toilet with her son and a spare nappy.

"We we're going to leave it," said Mrs Kalton. "I thought she was going to get me arrested."

However, yesterday bmibaby said their main priority was to protect passenger safety, security and all systems and procedures.

"Unfortunately there are occasions when this may be an inconvenience," said a spokesman.

But on Friday the Kaltons claimed that the crew member said Mrs Kalton could have been a terrorist and asked her to think how families of September 11 victims would feel.

Yesterday bmibaby said crew members were supposed to explain the procedure for security around the cockpit if an incident occurred.

"If, as alleged, this was not explained to the passenger then the airline apologises," said a spokesman.

After the incident the stewardess moved to the back of the plane for the remainder of the flight.

"In an attempt to calm an escalating situation, the crew member concerned felt it best that she carry out the remainder of her flight duties in the rear section of the aircraft," said a bmi spokesman.