British Airways investigating reports stewardess is offering sexual services between flights

Passengers are also promised unspecified 'adult entertainment on-board'

British Airways is investigating reports that one of its Heathrow-based stewardesses is selling sex – and her undergarments – during and in between flights.

Photos of the flight attendant’s risqué advertisements on social media were first reported by The Sun.  The photos show her in a variety of suggestive poses while in uniform on the plane.

FILE: A British Airways plane, at left, is towed past other planes sitting parked at Heathrow Airport in London.

FILE: A British Airways plane, at left, is towed past other planes sitting parked at Heathrow Airport in London. (AP)

For $33 a passenger can be the new owner of her underwear, twice that will be a “securing fee” where a prospective “client” can meet her at a hotel, according to the paper.

Passengers are also promised unspecified “adult entertainment on-board” if the price is right.

“All you have to do is give me a sum of money and you’ll be treated to a whole different experience of your choice,” she allegedly wrote.

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After the first report of the alleged advertisements, her social media accounts appeared to have been deleted. In a statement to Fox News, the airline said it had launched an investigation to identify the mystery stewardess.

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“We expect the highest standard of behaviour from all of our colleagues at all times, and we are investigating the claims,” the airline said.