BA claims it already charges a £1 booking fee for reservations made on its website may not be enough to head off disgruntled agents in the row over zero commissions.
Agents had asked BA to make a charge for bookings on its website so that fares available to them remained lower than for members of the public.
Agents' associations have said BA faces legal action if this is not the case.
The agents were already angry with the airline after it demanded they sign letters accepting the terms of the airline's move to zero commission.
The carrier said agents who fail to sign and return their letters by February 18 will not be allowed to sell BA tickets. Zero commission is due to come in on May 1.
One agent told BTE: “There has been talk of a fee of around £10 for using their website but it is more likely to be the pound they say they already charge. Agents are not going to be happy with that.
“You can be sure that their associations will be talking to their legal advisers. There's a strong feeling that BA is abusing its dominant position.”
But BA is adamant that it had always charged for booking on its website and has denied that it would be changing this fee. It has also stated that GDS fares will be lower than those on its website.
The airline already charges fees of up to £15 for bookings made off line.
But the agents are wary because they feel that whatever BA, as market leader, does and gets away with doing, other airlines will follow suit.
“BA not only wants us to sign away the rights we have under IATA rules but also wants to force more and more people to book directly on their website,” the agent said.