Relations between trade unions representing staff at Cargolux and Qatar Airways - which holds a 35% stake in the freight carrier - look set to reach a new low following a speech on 13 November given by union leadership.
Representatives of the OGBL and LCGB unions will stage a demonstration outside the Luxembourg parliament calling for the principality's leaders to take more active involvement in running the airline. Workers also want politicians to "rethink" Qatar Airways' role at Cargolux.
Hubert Hollerich, OGBL central secretary, will criticise the "harsh and undiplomatic behaviour of Qatar Airways" since it became involved in Cargolux.
In addition, he will call on the Doha-based airline to adopt an approach to management more akin with the "social" model normally employed in Luxembourg. To continue with its current approach risks igniting a conflict with the unions, he will warn.
Workers at the loss-making airline are waiting on the outcome of a report being compiled by consultancy Oliver Wyman. They are concerned that it will recommend sweeping changes and restructuring, including widespread job losses.
Oliver Wyman's recommendations are due to be presented at a board meeting on 30 November.
Qatar Airways was not immediately available to comment.