Obese passengers flying with Air France-KLM may have to pay more following the introduction of new rules later this year.

Company spokeswoman Monique Matze told AFP passengers who were unable to squeeze into a single aeroplane seat would have to pay 75 per cent of the cost of a second seat.

The new measure was being introduced for "safety" reasons and would come into effect on all flights from April 1, Matze said.

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