A Lufthansa Airbus A321-200, registration D-AISQ performing flight LH-848 from Frankfurt/Main (Germany) to Helsinki (Finland), was climbing out of Frankfurt when the crew stopped the climb at FL130 reporting fumes in cockpit and cabin. The aircraft returned to Frankfurt for a safe landing on runway 25C about 20 minutes after departure.
A replacement A321-200 registration D-AIST reached Helsinki with a delay of 2:40 hours.
Germany’s BFU reported an odour in cockpit and cabin. The occurrence was rated an incident and is being investigated by the BFU.
Full report here