Ryanair says it has been forced to cancel flights to Germany.
Trains, planes and public transit systems are at a standstill across much of the country after unions called a one-day strike over salaries.
Unions are seeking a pay increase of at least 10.5% and have dismissed offers from employers of 5% in two stages plus one-off payments. The walkout already caused disruption and delays on Sunday, as travellers scrambled to reach their destinations early.
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Ryanair said it has cancelled some flights to and from Cologne, Hamburg, Nuremberg and Bremen. It said it would be in contact with affected passengers.
In a statement, Ryanair said: "Due to airport personnel strike in Germany, Ryanair regrets to inform customers that it has been forced to cancel a small number of flights to and from Cologne, Hamburg, Nuremberg and Bremen on Monday, March 27.
"All affected customers will be notified via email, SMS and push notification. To ensure you are kept up to date on your day of travel plans, we ask all customers to check the website www.Ryanair.com or their Ryanair App."
Labour strikes are a regular occurrence in Germany and normally end in a compromise deal between unions and employers.
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