A union representing cabin crew at Lufthansa is threatening to strike after pay talks broke down.
Industrial action could start at short notice at selected airports and last for several hours initially, the UFO trade union said.
The walk outs could be a prelude to a longer strike campaign, the union warned.
Lufthansa operates about 1,800 flights a day, of which about 1,200 could possibly by affected by strikes, the carrier said.
The German airline has been in pay talks with the cabin crew’s union for more than a year as it bids to cut costs with measures such as longer working hours and changes to the pay grade structure.
Lufthansa is cutting 3,500 administrative jobs following losses earlier this year.