Over half a million passengers are expected to be affected by a major 24-hour strike across most of Germany's airports.

At Frankfurt, the country's busiest airport, operator Fraport said no passengers would be able to board and that disruptions would "almost certainly" affect transit travel, according to German daily Bild. Airports in Bremen, Cologne, Dortmund, Duesseldorf, Hamburg, Hanover, Leipzig, Munich and Stuttgart were also affected.

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 cancellation there on Sunday.