The International Air Transport Association has warned that a decision by South Africa to tighten up entry requirements for passengers travelling with children will hit airline profits.
South African Airways has this week agreed to comply with the new regulations, which are designed to combat child trafficking.
The new rules, which come into force from October 1, require parents to show birth certificates for children under 18 showing the names of both parents.
Minors travelling with one parent must have an affidavit of consent from the absent parent, a court order granting full parental responsibilities or legal guardianship of the child, or the death certificate of the absent parent.
The affidavit should be no more than three months old, from date of travel.
The rules are "well intentioned", they might stop people travelling to the country and would therefore hit the profitability of affected airlines.
The move has also been bitterly opposed by Board of Airline Representatives in South Africa, which said it would cause mass confusion and disruption to tourists and air travellers globally.
South Africa's Department of Home Affairs has already delayed the start-date of the contentious move from July 1.