Workers at Condor Berlin last week walked out for four hours in an unofficial strike against a new work schedule.
Condor Berlin, a Condor Airlines subsidiary, was hit On Thursday 14 December and five flights were affected.
Atwonline.com claimed that the action was organised by the ver.di union.
Ver.di and Condor management have restarted talks that were suspended in February 2005. The carrier wants its 240 cabin staff to transfer to a flight-hour system from a daily work schedule.