The trade union verdi has again called ground staff at German airline Lufthansa out on strike on Thursday and Friday, a move that is expected to affect passengers.
The industrial action over pay and conditions is to begin in the passenger-related areas at 4 am (0300 GMT) on Thursday and end at 7:10 am on Saturday.
There have already been two waves of strikes in the current wage dispute for around 25,000 ground staff, each of which paralysed passenger traffic for around a day.
Last week, Verdi staged strikes in Lufthansa's technical and cargo handling departments in order to force the company to make an improved offer.
Verdi has demanded 12.5% more pay and an inflation compensation bonus for one year. Lufthansa has so far offered 10% higher salaries for 28 months.
The next round of talks has been scheduled for March 13 and 14. Verdi is only prepared to hold talks earlier if an improved offer is made.
Employees who control the loading of aircraft or are responsible for handling freight at Lufthansa Cargo went on strike on Saturday, verdi said.
According to a Lufthansa spokeswoman, the strike meant that special freight, for example, was stopped. They are now trying to clear the backlog as quickly as possible.
Lufthansa had expressed its outrage at the continued strikes and criticized in particular verdi's preconditions for returning to the negotiating table, leading the company to question the wage negotiations as a whole.
Verdi negotiator Marvin Reschinsky regretted the impact on passengers in a statement: "Over the past few days, we have deliberately omitted passenger traffic from our strikes.
"However, by ignoring our request to negotiate, Lufthansa is telling us that it will only move when the pressure increases further.
"Passengers urgently need solutions and reliability; The employees and we are ready to provide this with a serious offer."
