Four Lufthansa flights on the Tel Aviv-Frankfurt route were canceled Friday as the German airline's staff implemented a widespread strike at all of Germany's airports.

Lufthansa's flights to and from Israel had been disrupted twice previously during the past week and a half, and additional disruptions are thought possible this week as well.

Lufthansa's cabin crew union UFO threatened further strikes if mediation talks scheduled for this week fail to yield results, the German weekly magazine Focus said yesterday. Lufthansa and union representatives agreed on Friday to begin a formal mediation procedure next Wednesday, after the airline offered permanent contracts to some temporary cabin crew.

Some 1,000 passengers on the Tel Aviv-Frankfurt route were affected by the labor action Friday. The carrier worked to reschedule them on other airlines in the Lufthansa group, such as Swiss International Air Lines, Austrian Airlines, Brussels Airlines and Germanwings, which fly to various destinations in Europe.

A Lufthansa spokesman in Israel apologized for the inconvenience and said the carrier was working to accommodate passengers whose flights had been canceled.

With reporting by Reuters.