The association’s advocacy group, which met last week to discuss the issue, will investigate some of the implications of Lufthansa’s credit card charge.
Under consideration is whether the charge will be displayed during the booking process so bookers understand the total trip cost at the point of sale.
GBTA Europe advocacy group chairman Hans Ingo Biehl said: "We have seen these credit card charges being introduced sporadically across Europe by carriers in the last few years.
"The Lufthansa move adds considerably more cost and confusion to buyers in the markets affected. We understand airlines re-visit business models but our primary concern is whether these charges are only presented at the end of the booking when by rights it should be at the fare comparison stage at the beginning of the booking process."