By Anthony France

Armed police boarded a flight at London's Heathrow Airport and arrested a trio involved in mid-air argument over a sex act.

The incident involved a model who allegedly flew into a drunken rage on a plane after catching her boyfriend engaging in a sex act with a woman sitting next to him.

Magazine covergirl Sarah Hannon, 35, is said to have woken from a nine-hour flight onboard Kingfisher Airlines to London from the Indian city of Bangalor to find partner Daniel Melia enjoying a sexual act, The Sun reports.

A police source said Ms Hannon fell asleep after drinking with Mr Melia before and during the flight.

Mr Melia then “got on well” with Ms Irby underneath a blanket but was stopped by hostesses – at which point Sarah awoke and started screaming.

“They certainly put the bang into Bangalore,” the source said.

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image: Shock ... model Sarah Hannon allegedly saw her partner enjoying a sex act with a woman next to him mid-flight (image by