Letters have been sent to the unnamed carriers identifying several types of potentially misleading green claims and inviting them to bring practices in line with EU consumer law within 30 days.
Watchdogs in Belgium, Netherlands and Spain focused on claims made by airlines that CO2 emissions could be offset by climate projects or using sustainable fuels, to which consumers could contribute by paying additional fees.
The commission said: “On their part, the airlines are yet to clarify whether such claims can be substantiated based on sound scientific evidence.”
