Euronews reported that Oliver Lackmann, managing director of airline TUI fly, part of the TUI group, is predicting a summer of disruptions at German airports.
Lackmann said German airports could be in for another costly summer of delays and disruptions due to lingering air-traffic control and logistics problems.
He made his comments in advance abstracts of a story due to run in Berlin daily Tagesspiegel on Monday.
The German Aviation Association (BDL) also warned of further delays and cancellations in an online briefing on Thursday.
Last year German airports were afflicted by strikes and bad weather, leading to costly compensation claims from passengers that burdened the airlines already struggling with lower ticket prices and ruinous competition.
German airline companies agreed at a summit last October on measures to tackle the problems in the industry such as ensuring more reserve aircraft are on hand and launching hiring and training drives.
Another industry summit has been scheduled for March 28 in Hamburg to review the success of the measures so far.