After the contract has been concluded, the contracting carrier or tour operator shall inform the passenger of any change in the identity of the carrier actually operating the flight segment(s) specified in the contract.
This change shall be brought to the passenger’s attention, including via the natural or legal person who sold the air ticket, as soon as it is known. The passenger must be informed at the latest at the time of check-in or before boarding if the connection is made without prior check-in.