The Lufthansa employees' council is concerned that the airline is set to cut jobs drastically and wants to meet management.
In an interview published today, council president Mr Wolf Liebetrau said: "We're realistic and already have it in our heads that Lufthansa is to be downsized.
"But structural changes must be discussed with us. It would be sensible to talk as soon as possible about changes that might occur over the next three to five years, so that we can look for socially acceptable solutions as soon as possible".
But a Lufthansa spokesman insisted there were currently no plans to change the group's dimension.
The German flag carrier, Europe's third-biggest in terms of market share, posted a net loss of €356 million in the first three months of the current year and expects to remain in the red at operating level for the whole year.
It has introduced short-time working for employees, a hiring freeze and a reduction in investment but has so far said it wanted to avoid redundancies.
AFP