Union calls strike by security staff at two Berlin's airports to strike Monday as part of ongoing wage negotiations.
On Saturday, Ver.di said it was urging workers to join the four-hour withdrawal starting at 5 am (4:00 GMT), which could cause problems for airline passengers. The strike will affect Tegel and Schoenfeld airports in the capital.
According to Verdi, the employers "provoked" the strike by proposing a wage increase of 2% over two years.
The union needs hourly wages to increase the number of workers doing security checks to 20 euros (22.81 dollars). According to the Employers' Association (BDLS) this could be as much as 30% increase in some cases.