Cargolux has been forced to postpone a board meeting scheduled for 25 October after union complaints that documentation had not been shared sufficiently in advance.
Union OGBL has expressed concerns about Cargolux's negotiations with Chinese state-owned investment company HNCA, which is considering buying a stake in the Luxembourg-based freight carrier. HNCA is tasked with developing Zhengzhou airport and the Henan province's civil aviation industry.
A perceived "lack of transparency" has agitated OGBL, which is insisting that it be kept informed "properly and comprehensively" and be shown "all the documents, including commercial bids submitted by other candidates interested in becoming a shareholder of Cargolux".
Luxembourg's infrastructure ministry has said it intends to reach a final decision on a new partner for the airline by year-end. In 2012, Qatar Airways sold a 35% Cargolux stake it had held for just 14 months.