(FILES) In this file photo taken on June 25, 2020 Aircrafts of German airline Lufthansa stand at the airport in Frankfurt am Main, western Germany, on June 25, 2020. - German national carrier Lufthansa said it would have to cancel almost all flights at its domestic hubs in Frankfurt and Munich on July 27, 2022 because of a planned strike by ground crew, adding to a summer of travel chaos across Europe. The one-day walkout called by Germany's powerful Verdi union will have a "massive impact", Lufthansa said in a statement on July 26. (Photo by Daniel ROLAND / AFP)

According to the company, the warning strike by Lufthansa ground staff announced by Verdi for Wednesday already had an impact on the travel plans of almost 7,500 passengers on Tuesday.

As the airline announced on Tuesday evening, around 45 flights that were due to arrive from long-distance destinations at German airports on Wednesday morning had to be canceled on Tuesday. Flights from Bangkok, Singapore, Boston, Denver, New York, Chicago, Los Angeles, San Francisco or Seoul to Munich were affected, as were connections from Buenos Aires, Johannesburg, Miami or New Delhi to Frankfurt.

The long-haul flights were all almost fully booked, it said. Lufthansa is currently working flat out to normalize flight operations again with a view to the forthcoming start of the holiday season in Bavaria and Baden-Württemberg.

According to Verdi, various Lufthansa companies at the hubs in Frankfurt and Munich as well as in Düsseldorf, Hamburg, Berlin, Bremen, Hanover, Stuttgart and Cologne will be on strike on Wednesday morning.