Lufthansa walkouts have already started to affect the company's flights, as the German airline announced Sunday that they would be cancelling 929 flights, involving 113,000 passengers, according to Reuters. The planned cabin crew strike on Monday will be a walk-out of three of Lufthansa's major airports.

At issue is the argument over early retirement benefits and pensions, as Lufthansa announced that their top management will be meeting with the cabin crew union leaders on Monday to discuss the strike.

Lufthansa's pilot strike earlier this year cost the company 130 million euros this year, The International Business Times reported.

Munich, one of Lufthansa's main hubs, will be affected after Sunday, due to the school holidays in the region of southern Germany.

"We're prepared operatively," said Lufthansa's Frankfurt-based spokesman, Boris Ogursky, according to Bloomberg.  "Lufthansa has sought to re-book flights with partner airlines, offer train tickets, waive cancellation fees and arrange hotel accommodation."

Lufthansa's CityLine, Germanwings, Eurowings, Air Dolomiti, Austrian Airlines, Swiss and Brussels Airlines divisions will not be affected by the strike, said Ogursky.