Over 500,000 individuals are experiencing travel challenges at airports in Germany due to a strike causing numerous flight cancellations. The strike, which stems from a disagreement over employee wages, is set to last for 24 hours.

The operator of Frankfurt airport, Germany’s busiest, said no passenger flights would depart from there on Monday, with delays and cancellations also possible on Tuesday.

Of the 1,116 incoming and outbound flights planned in Frankfurt on Monday, 1,050 had already been cancelled with that number expected to rise, a spokesperson for Fraport said.

The strike, called by the Verdi union on Friday, impacts 13 airports across the country, including Munich, Berlin and Dusseldorf.

Workers at Hamburg airport brought their strike forward by one day, with nearly 300 flight cancellations there on Sunday.

Verdi is demanding an 8% wage increase, or at least an increase of $380 more per month, as well as higher bonuses and additional time off.

Employers have rejected the demands as unaffordable.

Negotiations are due to continue later this month.